When a customer has multiple subscription contracts with the same merchant, you might want to combine the contents of their contracts together when their billing cycles align. When you combine the contents of multiple contracts together, you only need to create one billing attempt on any of the combined contract and their respective billing cycle. This billing attempt will be linked to all the combined [billing cycles](/docs/api/admin-graphql/unstable/objects/SubscriptionBillingCycle#connection-billingattempts). Shopify then creates only one order that has all the combined pricing and line information. And the order will be linked to all the combined [contracts](/docs/api/admin-graphql/unstable/objects/SubscriptionContract#connection-orders). This can be useful to save on shipping, billing, and other administrative costs. The app should create billing attempts on any contract that you combined.

For example, a customer might have one subscription that bills and delivers weekly, and one subscription that bills and delivers monthly. When the billing and delivery for both subscriptions occur within the same week, the merchant might want to combine the subscription orders for that week so they can be fulfilled in one shipment.

This tutorial shows you how to combine the contents of multiple contracts together on their respective billing cycles.

## What you'll learn

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

- Retrieve a draft of the most up-to-date contract information for a subscription billing cycle
- Combine multiple contracts to the same subscription draft
- Commit the combined contract information
- Fetch the combined contract information on a subscription billing cycle
- Create an order for a subscription billing cycle

## Requirements

> Note:
>
> - Most subscriptions, pre-order and try before you buy apps need to request API access through the [Partner Dashboard](/docs/apps/build/authentication-authorization/access-tokens/authorization-code-grant#ask-for-permission). We give API access to apps that are designed according to our [principles for subscriptions, pre-order and TBYB apps] (/docs/apps/selling-strategies/purchase-options#shopifys-principles).
> - Public apps that use subscriptions, pre-order or TBYB need to meet [specific requirements](/docs/apps/launch/app-requirements-checklist#purchase-option-apps) to be published on the Shopify App Store.
> - Custom apps [created in the Shopify admin](/docs/apps/build/authentication-authorization/access-tokens/generate-app-access-tokens-admin) can't use subscriptions, pre-order or TBYB because these apps can't use extensions or request access to protected scopes. If you're building a solution for a single store, then build your custom app in the Partner Dashboard.


- Your app can make [authenticated requests](/docs/api/admin-graphql#authentication) to the GraphQL Admin API.
- Your app has the `read_own_subscription_contracts` and `write_own_subscription_contracts` [access scopes](/docs/api/usage/access-scopes). Learn how to [configure your access scopes using Shopify CLI](/docs/apps/build/cli-for-apps/app-configuration).
- You've created [products](/docs/api/admin-graphql/latest/mutations/productcreate) and [product variants](/docs/api/admin-graphql/latest/mutations/productvariantcreate) in your development store.


- You've created at least two active [subscription contracts](/docs/apps/build/purchase-options/subscriptions/contracts/build-a-subscription-contract) for the same customer with recurring billing and delivery policies.
- You've familiarized yourself with [managing billing cycle contracts](/docs/apps/build/purchase-options/subscriptions/billing-cycles/manage-billing-cycle-contracts).

## What you can create

The following diagram shows a preview of how combining contracts works:

<figure class="figure"><img src="https://cdn.shopify.com/shopifycloud/shopify_dev/assets/apps/subscriptions/combined-contracts-f750cad642388462771fd72b59164fc98a185b7c22e4bcb37d6c8e674b247548.png" class="lazyload" alt="The combined contracts process workflow, as described below." width="1563" height="1499"></figure>

In this example, the buyer has two contracts, `one weekly` and one `bi-weekly` for coffee and tea. Both contracts have billing cycles and share similar billing cycles `01/01`, `01/15`, and `01/29`. Merchants might want to combine these subscription orders to consolidate fulfillment and shipping costs into one order.

## Step 1: Create a subscription draft

You can use the [`subscriptionBillingCycleContractEdit`](/docs/api/admin-graphql/latest/mutations/subscriptionbillingcyclecontractedit) mutation to create a subscription draft with the most up-to-date contract information on a specified billing cycle. Choose any one of the subscription contracts to be combined, and pass the contract ID and either the index or a date belonging to the billing cycle to specify the billing cycle.

Make note of the subscription contract draft ID. You'll use it to join additional contracts in [the next step](#step-2-combine-the-contracts).

<p>
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</div>

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

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTmutation {
  subscriptionBillingCycleContractEdit(
    billingCycleInput: {
      contractId: "gid://shopify/SubscriptionContract/123",
      selector: { date: "2023-01-10T00:00:00Z" }
    }
  ) {
    draft {
      # Subscription draft fields
      id
    }
    userErrors {
      field
      message
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>

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

<script type="text/plain" data-language="json">
RAW_MD_CONTENT{
  "data": {
    "draft": {
      "id": "gid://shopify/SubscriptionDraft/321"
    },
    "userErrors": []
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Step 2: Combine the contracts

After retrieving the draft ID, you can combine other contracts to the draft by passing their billing cycles and the draft ID to the [`subscriptionBillingCycleContractDraftConcatenate`](/docs/api/admin-graphql/latest/mutations/subscriptionbillingcyclecontractdraftconcatenate) mutation:

<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>


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</div>

</div>
</div>

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

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTmutation {
  subscriptionBillingCycleContractDraftConcatenate(
    draftId: "gid://shopify/SubscriptionDraft/321"
    concatenatedBillingCycleContracts: [
      {
        contractId: "gid://shopify/SubscriptionContract/456",
        selector: { date: "2023-01-10T00:00:00Z" }
      }
      {
        contractId: "gid://shopify/SubscriptionContract/789",
        selector: { date: "2023-01-10T00:00:00Z" }
      }
    ]
  ) {
    draft {
      # Subscription draft fields
      id
    }
    userErrors {
      field
      message
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>

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

<script type="text/plain" data-language="json">
RAW_MD_CONTENT{
  "data": {
    "draft": {
      "id": "gid://shopify/SubscriptionDraft/321"
    },
    "userErrors": []
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Step 3 (Optional): Update the subscription draft

After combining the contracts together, you can update the subscription draft if needed. For example, you might want to [add a discount](/docs/api/admin-graphql/latest/mutations/subscriptionDraftDiscountAdd) to reward the customer for having multiple subscriptions.

For more information about updating the subscription draft, refer to [Manage billing cycle contracts](/docs/apps/build/purchase-options/subscriptions/billing-cycles/manage-billing-cycle-contracts#step-2-update-the-subscription-draft).

## Step 4: Commit the subscription draft

When you commit the subscription draft, the changes that you've made become active on the billing cycles for which the draft was created and for which the contracts were combined. You can call the [`subscriptionDraft`](/docs/api/admin-graphql/latest/queries/subscriptionDraft) query to review the information on the subscription draft before committing it.

After you're satisfied with your updates, you can call the [`subscriptionBillingCycleContractDraftCommit`](/docs/api/admin-graphql/latest/mutations/subscriptionbillingcyclecontractdraftcommit) mutation to commit the changes for all the respective billing cycles for each contract:

<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>


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</div>

</div>
</div>

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

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTmutation {
  subscriptionBillingCycleContractDraftCommit(
    draftId: "gid://shopify/SubscriptionDraft/321"
  ) {
    contract {
      # Subscription billing cycle edited contract fields
      billingCycles (first:10) {
        edges { node { cycleIndex } }
      }
    }
    userErrors {
      field
      message
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>

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<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">
RAW_MD_CONTENT{
  "data": {
    "contract": {
      "edges": [
        {
          "node": { "cycleIndex": 5 }
        }
      ]
    },
    "userErrors": []
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Step 5: Fetch the edited contract

After committing the subscription draft, you might want to fetch the information on your edited contract.
You can do so using [`subscriptionBillingCycle`](/docs/api/admin-graphql/latest/queries/subscriptionBillingCycle) query.

<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">
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<div class="react-code-block-preload-codeline"></div>
</div>
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<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 query"></script>

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTsubscriptionBillingCycle(
  billingCycleInput: {
    # Note the input here could be any of the contracts that go through the combination process,
    # their billing cycles will share the same editedContract information.
    contractId: "gid://shopify/SubscriptionContract/456",
    selector: { date: "2023-01-10T00:00:00Z" }
  }
) {
  subscriptionBillingCycle {
    editedContract {
      # Subscription billing cycle edited contract fields
      lines(first: 10) {
        id
        quantity
        variantId
      }
    }
  }
  userErrors {
    field
    message
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>

<p>
<div class="react-code-block" data-preset="file">
<div class="react-code-block-preload ThemeMode-dim">
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<div class="react-code-block-preload-codeline-number"></div>
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</div>
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<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">
RAW_MD_CONTENT{
  "data": {
    "subscriptionBillingCycle": {
      "editedContract": {
         "lines": {
           "edges": [
            {
              "node": {
                "id": "gid://shopify/SubscriptionLine/2",
                "variantId": "gid://shopify/ProductVariant/11111",
                "quantity": 1,
              }
            }
          ]
        }
      }
    },
    "userErrors": []
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Step 6: Create an order

When the billing date comes, you can use [`subscriptionBillingAttemptCreate`](/docs/api/admin-graphql/latest/mutations/subscriptionbillingattemptcreate) mutation on any of the combined contracts to create an order.

If no [`billingCycleSelector`](/docs/api/admin-graphql/latest/input-objects/SubscriptionBillingCycleSelector) was specified, Shopify will create an order based on the current billing cycle's contract information by default.

If you want to create an order for a certain billing cycle, you must specify `billingCycleSelector`.

> Tip:
> If you specify both [`originTime`](/docs/api/admin-graphql/latest/input-objects/SubscriptionBillingAttemptInput#field-subscriptionbillingattemptinput-origintime) and billingCycleSelector arguments, then originTime needs to be within the selected billing cycle's start and end at date.

<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">
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</div>
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</div>
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</div>
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<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">
RAW_MD_CONTENTmutation {
  subscriptionBillingAttemptCreate(
    # Note the subscriptionContractId here could be any of the contracts that went through the combination process.
    subscriptionContractId: "gid://shopify/SubscriptionContract/456",
    subscriptionBillingAttemptInput: {
      idempotencyKey: "123",
      billingCycleSelector: { date: "2023-01-10T00:00:00Z" }
    }
  ) {
    subscriptionBillingAttempt {
      id
      errorMessage
      order {
        id
      }
      ready
    }
  }
}
END_RAW_MD_CONTENT</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>
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<div class="react-code-block-preload-codeline"></div>
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<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">
RAW_MD_CONTENT{
  "data": {
    "subscriptionBillingAttemptCreate": {
      "subscriptionBillingAttempt": {
        "id": "gid://shopify/SubscriptionBillingAttempt/1",
        "errorMessage": null,
        "order": {
          "id": "gid://shopify/Order/1"
        },
        "ready": true
      }
    },
    "userErrors": []
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Next steps

- Learn how to [manage orders and fulfillments for prepaid subscriptions](/docs/apps/build/purchase-options/subscriptions/fulfillments/sync-orders-subscriptions).