> Beta:
> Post-purchase checkout extensions are in beta and can be used without restrictions in a [development store](/docs/api/development-stores). To use post-purchase extensions on a live store, you need to [request access](/docs/apps/build/checkout/product-offers/build-a-post-purchase-offer#step-5-request-access).




This guide shows you how to create an upsell offer on the post-purchase page in checkout. An upsell offer enables buyers to add products to their order after they've completed their payment.

![The post purchase page displaying a snowboard offer for a 15 percent discount](/assets/api/cross-sells/post-purchase-upsell-final.png)

## What you'll learn

In this tutorial, you’ll learn how to do the following tasks:

- Generate a post-purchase extension with Shopify CLI.
- Run the extension locally and test it on a development store.
- Build the extension UI with the component library.
- Authenticate requests from the extension to your app server.
- Deploy your extension code to Shopify.
- Create a version of your extension and publish it.
- Request access to run the post-purchase checkout extension on a live store.

## Requirements

- You're familiar with [post-purchase checkout extensions](/docs/apps/build/checkout/product-offers#post-purchase-product-offers).
- You've created a [Partner account](https://www.shopify.com/partners) and a [development store](/docs/api/development-stores#create-a-development-store-to-test-your-app).
- You can [place test orders](https://help.shopify.com/manual/checkout-settings/) on your development store.
- You've [created an app that uses the Remix template](/docs/apps/build/scaffold-app).

## Step 1: Create the extension

To create a post-purchase checkout extension, you can use Shopify CLI, which generates starter code for building your extension and automates common development tasks.

In your app directory, run the following command to create a new post-purchase checkout extension:

<p>
<div class="react-code-block" data-preset="terminal">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
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</div>

</div>
</div>


<script type="text/plain" data-language="bash">
shopify app generate extension --template post_purchase_ui --name my-post-purchase-ui-extension
</script>

</div>
</p>


You should now have a new extension directory that includes the extension script at `src/index.{file-extension}`.

### Install dependencies

Run the following command to install the dependencies required for the app server inside the extension directory [that you created](#step-1-create-the-extension):

<p>
<div class="react-code-block" data-preset="terminal">
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</div>
</div>


<script type="text/plain" data-language="bash" data-title="npm">
npm install jsonwebtoken uuid
</script>
<script type="text/plain" data-language="bash" data-title="Yarn">
yarn add jsonwebtoken uuid
</script>
<script type="text/plain" data-language="bash" data-title="pnpm">
pnpm add jsonwebtoken uuid
</script>

</div>
</p>


## Step 2: Test the extension

Post-purchase checkout extensions in production are hosted and served by Shopify. During development and testing, you need to use a Shopify browser extension to render your local extensions in checkout.

As you're testing, the browser extension automatically updates the checkout URLs.

1. Navigate to your app directory.
2. Either start or restart your server to build and preview your app:

    <p>
    <div class="react-code-block" data-preset="terminal">
    <div class="react-code-block-preload ThemeMode-dim">
    <div class="react-code-block-preload-bar "></div>
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    <div class="react-code-block-preload-code-container">
    <div class="react-code-block-preload-codeline-number"></div>
    <div class="react-code-block-preload-codeline"></div>
    </div>

    </div>
    </div>


    <script type="text/plain" data-language="bash">
    shopify app dev 
    </script>

    </div>
    </p>


    <br>
    When you run the `dev` command, Shopify CLI builds and serves your app. It also instructs you through multiple configuration steps. If you've already run `dev` for this app, then some of these steps are skipped.

    To learn about the processes that are executed when you run `dev`, refer to the [Shopify CLI command reference](/docs/api/shopify-cli/app/app-dev).

3. Press `p` to open the developer console. In the developer console page, click **View checkout_post_purchase preview instructions** next to your post-purchase extension.

    ![The CLI developer console where you can copy the post-purchase extension URL](/assets/api/post-purchase/post-purchase-developer-console.png)

3. Install the **Shopify Post-purchase Developer Tools** for [Chrome](https://chrome.google.com/webstore/detail/shopify-post-purchase-dev/nenmcifhoegealiiblnpihbnjenleong) browser extension.

4. Copy the post-purchase extension URL from the developer console.

5. In the browser extension settings, enter the extension URL from the developer console:

    ![Browser extension](/assets/api/cross-sells/post-purchase-browser-extension-with-root-url.png)

6. Place a test order in your development store and go through the checkout steps. The post-purchase UI is shown after the payment step, but before the **Order status** page:
    ![The post purchase page displaying an example primary button, image and offer](/assets/api/cross-sells/post-purchase-default-extension.png)

## Step 3: Build the extension UI

The [UI components](/docs/api/checkout-extensions/post-purchase/components) for post-purchase checkout extensions are managed by Shopify to ensure that the checkout is fast, optimized for mobile, and integrated with Shop Pay.

Post-purchase extensions have access to the [Checkout::PostPurchase::ShouldRender](/docs/api/checkout-extensions/post-purchase/api#extensionpoints) and [Checkout::PostPurchase::Render](docs/api/checkout-extensions/post-purchase/api#extensionpoints) extension points.

The [extension points API](/docs/api/checkout-extensions/post-purchase/api) provides helper functions to allow you to calculate potential order totals, update the order, modify metafields, and more.

Update the `extension/my-post-purchase-ui-extension/src/index` file with the following code. Replace the `APP_URL` constant, at the top of the file, with your local tunnel URL:

<p>
<div class="react-code-block" data-preset="file">
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</div>
</div>

<script data-option="filename" data-value="src/index"></script>

<script type="text/plain" data-language="jsx" data-filename="src/index.jsx" data-title="React">

import { useEffect, useState } from "react";
import {
  extend,
  render,
  useExtensionInput,
  BlockStack,
  Button,
  CalloutBanner,
  Heading,
  Image,
  Text,
  TextContainer,
  Separator,
  Tiles,
  TextBlock,
  Layout,
} from "@shopify/post-purchase-ui-extensions-react";

// For local development, replace APP_URL with your local tunnel URL.
const APP_URL = "https://abcd-1234.trycloudflare.com";

// Preload data from your app server to ensure that the extension loads quickly.
extend(
  "Checkout::PostPurchase::ShouldRender",
  async ({ inputData, storage }) => {
    const postPurchaseOffer = await fetch(`${APP_URL}/api/offer`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
      }),
    }).then((response) => response.json());

    await storage.update(postPurchaseOffer);

    // For local development, always show the post-purchase page
    return { render: true };
  }
);

render("Checkout::PostPurchase::Render", () => <App />);

export function App() {
  const { storage, inputData, calculateChangeset, applyChangeset, done } =
    useExtensionInput();
  const [loading, setLoading] = useState(true);
  const [calculatedPurchase, setCalculatedPurchase] = useState();

  const { offers } = storage.initialData;

  const purchaseOption = offers[0];

  // Define the changes that you want to make to the purchase, including the discount to the product.
  useEffect(() => {
    async function calculatePurchase() {
      // Call Shopify to calculate the new price of the purchase, if the above changes are applied.
      const result = await calculateChangeset({
        changes: purchaseOption.changes,
      });

      setCalculatedPurchase(result.calculatedPurchase);
      setLoading(false);
    }

    calculatePurchase();
  }, [calculateChangeset, purchaseOption.changes]);

  // Extract values from the calculated purchase.
  const shipping =
    calculatedPurchase?.addedShippingLines[0]?.priceSet?.presentmentMoney
      ?.amount;
  const taxes =
    calculatedPurchase?.addedTaxLines[0]?.priceSet?.presentmentMoney?.amount;
  const total = calculatedPurchase?.totalOutstandingSet.presentmentMoney.amount;
  const discountedPrice =
    calculatedPurchase?.updatedLineItems[0].totalPriceSet.presentmentMoney
      .amount;
  const originalPrice =
    calculatedPurchase?.updatedLineItems[0].priceSet.presentmentMoney.amount;

  async function acceptOffer() {
    setLoading(true);

    // Make a request to your app server to sign the changeset with your app's API secret key.
    const token = await fetch(`${APP_URL}/api/sign-changeset`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
        changes: purchaseOption.id,
      }),
    })
      .then((response) => response.json())
      .then((response) => response.token)
      .catch((e) => console.log(e));

    // Make a request to Shopify servers to apply the changeset.
    await applyChangeset(token);

    // Redirect to the thank-you page.
    done();
  }

  function declineOffer() {
    setLoading(true);
    // Redirect to the thank-you page
    done();
  }

  return (
    <BlockStack spacing="loose">
      <CalloutBanner>
        <BlockStack spacing="tight">
          <TextContainer>
            <Text size="medium" emphasized>
              It&#39;s not too late to add this to your order
            </Text>
          </TextContainer>
          <TextContainer>
            <Text size="medium">
              Add the {purchaseOption.productTitle} to your order and{" "}
            </Text>
            <Text size="medium" emphasized>
              {purchaseOption.changes[0].discount.title}
            </Text>
          </TextContainer>
        </BlockStack>
      </CalloutBanner>
      <Layout
        media={[
          { viewportSize: "small", sizes: [1, 0, 1], maxInlineSize: 0.9 },
          { viewportSize: "medium", sizes: [532, 0, 1], maxInlineSize: 420 },
          { viewportSize: "large", sizes: [560, 38, 340] },
        ]}
      >
        <Image
          description="product photo"
          source={purchaseOption.productImageURL}
        />
        <BlockStack />
        <BlockStack>
          <Heading>{purchaseOption.productTitle}</Heading>
          <PriceHeader
            discountedPrice={discountedPrice}
            originalPrice={originalPrice}
            loading={!calculatedPurchase}
          />
          <ProductDescription textLines={purchaseOption.productDescription} />
          <BlockStack spacing="tight">
            <Separator />
            <MoneyLine
              label="Subtotal"
              amount={discountedPrice}
              loading={!calculatedPurchase}
            />
            <MoneyLine
              label="Shipping"
              amount={shipping}
              loading={!calculatedPurchase}
            />
            <MoneyLine
              label="Taxes"
              amount={taxes}
              loading={!calculatedPurchase}
            />
            <Separator />
            <MoneySummary label="Total" amount={total} />
          </BlockStack>
          <BlockStack>
            <Button onPress={acceptOffer} submit loading={loading}>
              Pay now · {formatCurrency(total)}
            </Button>
            <Button onPress={declineOffer} subdued loading={loading}>
              Decline this offer
            </Button>
          </BlockStack>
        </BlockStack>
      </Layout>
    </BlockStack>
  );
}

function PriceHeader({ discountedPrice, originalPrice, loading }) {
  return (
    <TextContainer alignment="leading" spacing="loose">
      <Text role="deletion" size="large">
        {!loading && formatCurrency(originalPrice)}
      </Text>
      <Text emphasized size="large" appearance="critical">
        {" "}
        {!loading && formatCurrency(discountedPrice)}
      </Text>
    </TextContainer>
  );
}

function ProductDescription({ textLines }) {
  return (
    <BlockStack spacing="xtight">
      {textLines.map((text, index) => (
        <TextBlock key={index} subdued>
          {text}
        </TextBlock>
      ))}
    </BlockStack>
  );
}

function MoneyLine({ label, amount, loading = false }) {
  return (
    <Tiles>
      <TextBlock size="small">{label}</TextBlock>
      <TextContainer alignment="trailing">
        <TextBlock emphasized size="small">
          {loading ? "-" : formatCurrency(amount)}
        </TextBlock>
      </TextContainer>
    </Tiles>
  );
}

function MoneySummary({ label, amount }) {
  return (
    <Tiles>
      <TextBlock size="medium" emphasized>
        {label}
      </TextBlock>
      <TextContainer alignment="trailing">
        <TextBlock emphasized size="medium">
          {formatCurrency(amount)}
        </TextBlock>
      </TextContainer>
    </Tiles>
  );
}

function formatCurrency(amount) {
  if (!amount || parseInt(amount, 10) === 0) {
    return "Free";
  }
  return `$${amount}`;
}


</script>
<script type="text/plain" data-language="js" data-filename="src/index.js" data-title="Vanilla">
import {
  extend,
  BlockStack,
  Button,
  CalloutBanner,
  Heading,
  Image,
  Text,
  TextContainer,
  Separator,
  Tiles,
  TextBlock,
  Layout,
} from "@shopify/post-purchase-ui-extensions";

// For local development, replace APP_URL with your local tunnel URL.
const APP_URL = "https://abcd-1234.trycloudflare.com";

// Preload data from your app server to ensure the extension loads quickly.
extend(
  "Checkout::PostPurchase::ShouldRender",
  async ({ inputData, storage }) => {
    const postPurchaseOffer = await fetch(`${APP_URL}/api/offer`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
      }),
    })
      .then((response) => response.json())
      .catch((error) => console.log(error));

    await storage.update(postPurchaseOffer);

    // For local development, always show the post-purchase page
    return { render: true };
  }
);

extend(
  "Checkout::PostPurchase::Render",
  (root, { done, storage, calculateChangeset, applyChangeset, inputData }) => {
    const { offers } = storage.initialData;
    const {
      id,
      productTitle,
      productImageURL,
      productDescription,
      discountedPrice,
      originalPrice,
      changes,
    } = offers[0];

    const calloutBannerComponent = root.createComponent(
      CalloutBanner,
      { title: "It's not too late to add this to your order." },
      [
        root.createComponent(
          Text,
          { size: "medium" },
          `Add the ${productTitle} to your order and `
        ),
        root.createComponent(
          Text,
          { size: "medium", emphasized: true },
          "save 15%."
        ),
      ]
    );

    const originalPriceAmount = root.createText(formatCurrency(originalPrice));
    const discountedPriceAmount = root.createText(
      formatCurrency(discountedPrice)
    );

    const priceHeaderComponent = root.createComponent(
      TextContainer,
      { alignment: "leading", spacing: "loose" },
      [
        root.createComponent(
          Text,
          { role: "deletion", size: "large" },
          originalPriceAmount
        ),
        " ",
        root.createComponent(
          Text,
          { emphasized: true, size: "large", appearance: "critical" },
          discountedPriceAmount
        ),
      ]
    );

    const productDescriptionTextBlocks = productDescription.map((text) =>
      root.createComponent(TextBlock, { subdued: true }, text)
    );
    const productDescriptionComponent = root.createComponent(
      BlockStack,
      { spacing: "xtight" },
      productDescriptionTextBlocks
    );

    const acceptButton = root.createComponent(Button, {
      onPress: acceptOffer,
      submit: true,
      disabled: true,
      loading: true,
    });
    const declineButton = root.createComponent(
      Button,
      { onPress: declineOffer, subdued: true },
      "Decline this offer"
    );
    const buttonsComponent = root.createComponent(BlockStack, {}, [
      acceptButton,
      declineButton,
    ]);

    const wrapperComponent = root.createComponent(BlockStack, {}, [
      root.createComponent(Heading, {}, productTitle),
      priceHeaderComponent,
      productDescriptionComponent,
      buttonsComponent,
    ]);

    // Get shipping costs and taxes and update the UI.
    (async function updatePriceBreakdownUI() {
      // Request Shopify to calculate shipping costs and taxes for the upsell.
      const result = await calculateChangeset({ changes });

      // Extract values from response.
      const shipping =
        result.calculatedPurchase?.addedShippingLines[0]?.priceSet
          ?.presentmentMoney?.amount;
      const taxes =
        result.calculatedPurchase?.addedTaxLines[0]?.priceSet?.presentmentMoney
          ?.amount;
      const total =
        result.calculatedPurchase?.totalOutstandingSet.presentmentMoney.amount;
      const originalPrice =
        result.calculatedPurchase?.updatedLineItems[0].priceSet.presentmentMoney
          .amount;
      const discountedPrice =
        result.calculatedPurchase?.updatedLineItems[0].totalPriceSet
          .presentmentMoney.amount;

      originalPriceAmount.updateText(formatCurrency(originalPrice));
      discountedPriceAmount.updateText(formatCurrency(discountedPrice));

      // Create the price breakdown UI components.
      function createPriceBreakdownLine({ label, amount, textSize = "small" }) {
        return root.createComponent(Tiles, {}, [
          root.createComponent(TextBlock, { size: "small" }, label),
          root.createComponent(
            TextContainer,
            { alignment: "trailing" },
            root.createComponent(
              TextBlock,
              { emphasized: true, size: textSize },
              amount
            )
          ),
        ]);
      }

      const priceBreakdownComponent = root.createComponent(
        BlockStack,
        { spacing: "tight" },
        [
          root.createComponent(Separator),
          createPriceBreakdownLine({
            label: "Subtotal",
            amount: formatCurrency(discountedPrice),
          }),
          createPriceBreakdownLine({
            label: "Shipping",
            amount: formatCurrency(shipping),
          }),
          createPriceBreakdownLine({
            label: "Taxes",
            amount: formatCurrency(taxes),
          }),
          root.createComponent(Separator),
          createPriceBreakdownLine({
            label: "Total",
            amount: formatCurrency(total),
            textSize: "medium",
          }),
        ]
      );

      // And add the components to the UI.
      wrapperComponent.insertChildBefore(
        priceBreakdownComponent,
        buttonsComponent
      );

      // Enable the accept button.
      acceptButton.updateProps({ disabled: false, loading: false });
      acceptButton.appendChild(`Pay now · ${formatCurrency(total)}`);
    })();

    // Provide a button for declining the upsell offer.
    function declineOffer() {
      acceptButton.updateProps({ disabled: true });
      declineButton.updateProps({ disabled: true, loading: true });
      done();
    }

    // Provide a button for accepting the upsell offer.
    async function acceptOffer() {
      async function doAcceptOrder() {
        // Make a request to your app server to sign the changeset with your app's API secret key.
        const token = await fetch(`${APP_URL}/api/sign-changeset`, {
          method: "POST",
          headers: {
            Authorization: `Bearer ${inputData.token}`,
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            referenceId: inputData.initialPurchase.referenceId,
            changes: id,
          }),
        })
          .then((response) => response.json())
          .then((response) => response.token)
          .catch((e) => console.log(e));

        // Make a request to Shopify servers to apply the changeset.
        await applyChangeset(token);
      }

      // First update the state of the buttons, then call the async function.
      acceptButton.updateProps({ disabled: true, loading: true });
      declineButton.updateProps({ disabled: true });
      await doAcceptOrder();
      done();
    }

    // Put all of the components together and render the UI.
    root.appendChild(
      root.createComponent(BlockStack, { spacing: "loose" }, [
        calloutBannerComponent,
        root.createComponent(
          Layout,
          {
            media: [
              { viewportSize: "small", sizes: [1, 0, 1], maxInlineSize: 0.9 },
              {
                viewportSize: "medium",
                sizes: [532, 0, 1],
                maxInlineSize: 420,
              },
              { viewportSize: "large", sizes: [560, 38, 340] },
            ],
          },
          [
            root.createComponent(Image, {
              source: productImageURL,
              description: "Product photo",
            }),
            root.createComponent(BlockStack),
            wrapperComponent,
          ]
        ),
      ])
    );
  }
);

function formatCurrency(amount) {
  if (!amount || parseInt(amount, 10) === 0) {
    return "Free";
  }
  return `$${amount}`;
}

</script>

</div>
</p>


### How the extension code works

The following sections explain how different parts of the example extension code work.

#### Fetch product data in `Checkout::PostPurchase::ShouldRender`

The `Checkout::PostPurchase::ShouldRender` handler pre-fetches product data from the server that's running locally. You pass the [token](/docs/api/checkout-extensions/post-purchase/jwt-specification) in the `Authorization` header so that you can authenticate it with `authenticate.public` in the Remix app, and POST the reference ID to the server. By doing this, you can verify that the request came from Shopify, and that the request is signed with the same secret key as the app.

The data returned from the server is then stored in the extension's storage.

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</div>

<script data-option="filename" data-value="src/index"></script>

<script type="text/plain" data-language="jsx" data-filename="src/index.jsx" data-title="React">
extend(
  "Checkout::PostPurchase::ShouldRender",
  async ({ inputData, storage }) => {
    const postPurchaseOffer = await fetch(`${APP_URL}/api/offer`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
      }),
    }).then((response) => response.json());

    await storage.update(postPurchaseOffer);

    // For local development, always show the post-purchase page
    return { render: true };
  }
);
</script>
<script type="text/plain" data-language="js" data-filename="src/index.js" data-title="Vanilla">
extend(
  "Checkout::PostPurchase::ShouldRender",
  async ({ inputData, storage }) => {
    const postPurchaseOffer = await fetch(`${APP_URL}/api/offer`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
      }),
    }).catch((error) => console.log(error));

    await storage.update(postPurchaseOffer);

    // For local development, always show the post-purchase page
    return { render: true };
  }
);
</script>

</div>
</p>


#### Compute shipping and taxes using `calculateChangeset`
Shipping costs and taxes are calculated based on the shipping address.
The order changes are passed to the `calculateChangeset` function provided by the API. The returned data is used to update the UI.

<p>
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</div>
</div>

<script data-option="filename" data-value="src/index"></script>

<script type="text/plain" data-language="jsx" data-filename="src/index.jsx" data-title="React">
 // Define the changes that you want to make to the purchase, including the discount to the product.
  useEffect(() => {
    async function calculatePurchase() {
      // Call Shopify to calculate the new price of the purchase, if the above changes are applied.
      const result = await calculateChangeset({
        changes: purchaseOption.changes,
      });

      setCalculatedPurchase(result.calculatedPurchase);
      setLoading(false);
    }

    calculatePurchase();
  }, [calculateChangeset, purchaseOption.changes]);
</script>
<script type="text/plain" data-language="js" data-filename="src/index.js" data-title="Vanilla">
// Request Shopify to calculate shipping costs and taxes for the upsell.
const result = await calculateChangeset({ changes });

// Extract values from response.
const shipping =
  result.calculatedPurchase?.addedShippingLines[0]?.priceSet
    ?.presentmentMoney?.amount;
const taxes =
  result.calculatedPurchase?.addedTaxLines[0]?.priceSet?.presentmentMoney
    ?.amount;
const total =
  result.calculatedPurchase?.totalOutstandingSet.presentmentMoney.amount;
  const originalPrice =
  result.calculatedPurchase?.updatedLineItems[0].priceSet.presentmentMoney
    .amount;
const discountedPrice =
  result.calculatedPurchase?.updatedLineItems[0].totalPriceSet
    .presentmentMoney.amount;
</script>

</div>
</p>


#### Update the order using `applyChangeset`

The `acceptOffer` handler posts a request to the server to sign the `changes` as a JWT token. The request includes `inputData.token`, which the server uses to verify Shopify's request. The following code calls `applyChangeset` with the JWT token returned from the server.

<p>
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</div>
</div>

<script data-option="filename" data-value="src/index"></script>

<script type="text/plain" data-language="jsx" data-filename="src/index.jsx" data-title="React">
async function acceptOffer() {
  setLoading(true);

  // Make a request to your app server to sign the changeset with your app's API secret key.
  const token = await fetch(`${APP_URL}/api/sign-changeset`, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${inputData.token}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      referenceId: inputData.initialPurchase.referenceId,
      changes: purchaseOption.id,
    }),
  })
    .then((response) => response.json())
    .then((response) => response.token)
    .catch((e) => console.log(e));

  // Make a request to Shopify servers to apply the changeset.
  await applyChangeset(token);

  // Redirect to the thank-you page.
  done();
}

function declineOffer() {
  setLoading(true);
  // Redirect to the thank-you page
  done();
}
</script>
<script type="text/plain" data-language="js" data-filename="src/index.js" data-title="Vanilla">
async function acceptOffer() {
  async function doAcceptOrder() {
    // Make a request to your app server to sign the changeset with your app's API secret key.
    const token = await fetch(`${APP_URL}/api/sign-changeset`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${inputData.token}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        referenceId: inputData.initialPurchase.referenceId,
        changes: id,
      }),
    })
      .then((response) => response.json())
      .then((response) => response.token)
      .catch((e) => console.log(e));

    // Make a request to Shopify servers to apply the changeset.
    await applyChangeset(token);
  }

  // First update the state of the buttons, then call the async function.
  acceptButton.updateProps({ disabled: true, loading: true });
  declineButton.updateProps({ disabled: true });
  await doAcceptOrder();
  done();
}
</script>

</div>
</p>


## Step 3: Update the app server

Your app requires two endpoints to support the extension. The first endpoint is used to fetch the product data for the upsell. The second endpoint is used to sign the changeset, so Shopify can verify the request to edit the order that came from your app.

### Define upsell product data

Create a new file called `app/offer.server.js`, which defines a function that's used to fetch the product data for the upsell. For simplicity in this tutorial, you'll hardcode the product data. The following logic can be replaced with an API call to Shopify or your own database:

<p>
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</div>
</div>

<script data-option="filename" data-value="app/offer.server.js"></script>

<script type="text/plain" data-language="js">
const OFFERS = [
  {
    id: 1,
    title: "One time offer",
    productTitle: "The S-Series Snowboard",
    productImageURL:
      "https://cdn.shopify.com/s/files/1/0", // Replace this with the product image's URL.
    productDescription: ["This PREMIUM snowboard is so SUPER DUPER awesome!"],
    originalPrice: "699.95",
    discountedPrice: "699.95",
    changes: [
      {
        type: "add_variant",
        variantID: 123456789, // Replace with the variant ID.
        quantity: 1,
        discount: {
          value: 15,
          valueType: "percentage",
          title: "15% off",
        },
      },
    ],
  },
];

/*
 * For testing purposes, product information is hardcoded.
 * In a production application, replace this function with logic to determine
 * what product to offer to the customer.
 */
export function getOffers() {
  return OFFERS;
}

/*
 * Retrieve discount information for the specific order on the backend instead of relying
 * on the discount information that is sent from the frontend.
 * This is to ensure that the discount information is not tampered with.
 */
export function getSelectedOffer(offerId) {
  return OFFERS.find((offer) => offer.id === offerId);
}
</script>

</div>
</p>


You can use the following GraphQL query to fetch the first product in your Shopify store. Update the `getOffer` function with the data returned from the query, or the information from the product page in your Shopify admin.

<p>
<div class="react-stacked-code-block ThemeMode-dim" data-preset="stacked">
<script data-option="title" data-value="POST https://{shop}.myshopify.com/admin/api/{api_version}/graphql.json"></script>


<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>

</div>
</div>

<script data-option="filename" data-value="GraphQL mutation"></script>

<script type="text/plain" data-language="graphql">
{
  products(first: 1) {
    edges {
      node {
        id
        legacyResourceId
        title
        featuredImage {
          url
        }
        description
        variants(first: 1) {
          edges {
            node {
              price
              compareAtPrice
              id
              legacyResourceId
            }
          }
        }
      }
    }
  }
}
</script>

</div>
</p>

<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>

</div>
</div>

<script data-option="filename" data-value="JSON response"></script>

<script type="text/plain" data-language="json">
{
  "data": {
    "products": {
      "edges": [
        {
          "node": {
            "id": "gid://shopify/Product/123456789",
            "legacyResourceId": "123456789",
            "title": "The S-Series Snowboard",
            "featuredImage": {
              "url": "https://cdn.shopify.com/s/files/1/123"
            },
            "description": "This PREMIUM snowboard is so SUPERDUPER awesome!",
            "variants": {
              "edges": [
                {
                  "node": {
                    "price": "699.95",
                    "compareAtPrice": null,
                    "id": "gid://shopify/ProductVariant/987654321",
                    "legacyResourceId": "987654321"
                  }
                }
              ]
            }
          }
        }
      ]
    }
  }
}
</script>

</div>
</p>


</div>
</p>


> Note:
> Install the [Shopify GraphiQL app](/docs/api/usage/api-exploration/admin-graphiql-explorer) to make GraphQL queries to your store.

### Define the offer and sign changeset endpoints

In the `app/routes` folder, define two new routes. The first route is used to fetch the product data that you previously defined for the upsell. The second route is used to sign the changeset, so Shopify can verify that the request came from your app.

Both routes will verify that the request came from Shopify by checking that the JWT token is signed by the app's secret key using `authenticate.public`.

Add the following files to your project:

<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
<div class="react-code-block-preload-bar "></div>
<div class="react-code-block-preload-placeholder-container">
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>
<div class="react-code-block-preload-code-container">
<div class="react-code-block-preload-codeline-number"></div>
<div class="react-code-block-preload-codeline"></div>
</div>

</div>
</div>


<script type="text/plain" data-language="js" data-filename="app/routes/api.offer.jsx" data-title="Get offers">
import { json } from "@remix-run/node";

import { authenticate } from "../shopify.server";
import { getOffers } from "../offer.server";

// The loader responds to preflight requests from Shopify
export const loader = async ({ request }) => {
  await authenticate.public(request);
};

// The action responds to the POST request from the extension. Make sure to use the cors helper for the request to work.
export const action = async ({ request }) => {
  const { cors } = await authenticate.public(request);

  const offers = getOffers();
  return cors(json({ offers }));
};
</script>
<script type="text/plain" data-language="js" data-filename="app/routes/api.sign-changeset.jsx" data-title="Sign changeset">
import { json } from "@remix-run/node";
import { v4 as uuidv4 } from "uuid";
import jwt from "jsonwebtoken";

import { authenticate } from "../shopify.server";
import { getSelectedOffer } from "../offer.server";

// The loader responds to preflight requests from Shopify
export const loader = async ({ request }) => {
  await authenticate.public(request);
};

// The action responds to the POST request from the extension. Make sure to use the cors helper for the request to work.
export const action = async ({ request }) => {
  const { cors } = await authenticate.public(request);

  const body = await request.json();

  const selectedOffer = getSelectedOffer(body.changes);

  const payload = {
    iss: process.env.SHOPIFY_API_KEY,
    jti: uuidv4(),
    iat: Date.now(),
    sub: body.referenceId,
    changes: selectedOffer?.changes,
  };

  const token = jwt.sign(payload, process.env.SHOPIFY_API_SECRET);
  return cors(json({ token }));
};
</script>

</div>
</p>


You are now ready to test your upsell functionality extension. Refer to [Step 2](#step-2-test-the-extension) for testing in these instructions.

![The post purchase page displaying a snowboard offer for a 15 percent discount](/assets/api/cross-sells/post-purchase-upsell-final.png)

## Step 4: Deploy the extension

When you're ready to release your changes to users, you can create and release an [app version](/docs/apps/launch/deployment/app-versions). An app version is a snapshot of your app configuration and all extensions.





1. Navigate to your app directory.
2. Run the following command.

    Optionally, you can provide a name or message for the version using the `--version` and `--message` flags.

    <p>
    <div class="react-code-block" data-preset="terminal">
    <div class="react-code-block-preload ThemeMode-dim">
    <div class="react-code-block-preload-bar "></div>
    <div class="react-code-block-preload-placeholder-container">
    <div class="react-code-block-preload-code-container">
    <div class="react-code-block-preload-codeline-number"></div>
    <div class="react-code-block-preload-codeline"></div>
    </div>

    </div>
    </div>


    <script type="text/plain" data-language="bash">
    shopify app deploy 
    </script>

    </div>
    </p>


Releasing an app version replaces the current active version that's served to stores that have your app installed. It might take several minutes for app users to be upgraded to the new version.



> Tip:
> If you want to create a version, but avoid releasing it to users, then run the `deploy` command with a `--no-release` flag.
>
> You can release the unreleased app version using Shopify CLI's [`release`](/docs/api/shopify-cli/app/app-release) command, or through the Partner Dashboard.



## Step 5: Request access

If you want to run the post-purchase checkout extension on a live store, then you need to request access. Before you request access, you need an unpublished app in a [development store](/docs/api/development-stores#create-a-development-store-to-test-your-app).

After your access request has been approved, any apps that you distribute through the Shopify App Store also need to be [submitted for review](/docs/apps/launch/app-store-review/review-process) in the Partner Dashboard. The review process is slightly different for existing apps and new apps.

> Note:
> All merchants can install apps from the Shopify App Store that use post-purchase checkout extensions. Only Plus merchants can install custom apps which use post-purchase checkout extensions.

**For existing apps:**

* You need to test your app using an unpublished app in a development store.
* To add the post-purchase checkout extension to a published app, you must submit the unpublished testing app for review in the Partner Dashboard.
* If the new app meets the stated requirements, then it will be approved and the post-purchase extension can be added to your existing published app.

**For new apps:**

* You need to test your app using an unpublished app in a development store.
* To add the post-purchase checkout extension to a published app, you must submit the unpublished testing app for review in the Partner Dashboard.
* If the new app meets the stated requirements, then it will be approved and listed in the Shopify App Store.

### Request access from the Partner Dashboard

1. From your Partner Dashboard, click **Apps**.
2. Click the name of the app that you want to change.
3. Click **API access**.
4. On the **Access post-purchase extensions** card, click **Request access**.
5. In the **Post-purchase** page that opens, describe why you're applying for access.
6. You'll see a banner that your request is under review. The review process can take up to seven days.

After your request is approved, you're notified in the Partner Dashboard that your app has full access to the post-purchase extensions.

## Next steps

- Learn how to create a [post-purchase subscription upsell](/docs/apps/build/checkout/product-offers/create-a-post-purchase-subscription).
- Review the post-purchase targets [API reference](/docs/api/checkout-extensions/post-purchase/api).