Migrating your existing subscriptions to Shopify will allow you to continue charging your existing subscribers without experiencing any disruption in service.

In this tutorial, you’ll learn how to migrate existing subscription contracts to Shopify.

## Requirements

This tutorial assumes that you've already completed the preceding tutorial to [migrate customer information](/docs/apps/build/purchase-options/subscriptions/migrate-to-subscriptions-api/migrate-customer-information).

## What you'll learn

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

- Import subscription contracts
- Create billing attempts

## Step 1: Import subscription contracts

After you've created or updated Shopify's customer record, you can import the subscription contracts. [Subscription contracts](/docs/api/admin-graphql/latest/objects/SubscriptionContract) include information about the variant, the plan, the payment method, and the billing and shipping addresses.

To import subscription contracts you can use the [subscriptionContractAtomicCreate](/docs/api/admin-graphql/latest/mutations/subscriptionContractAtomicCreate) mutation.

The following example creates a subscription contract including the customer that was previously imported, [the payment method](/docs/apps/build/purchase-options/subscriptions/migrate-to-subscriptions-api/migrate-customer-information#step-2-import-payment-methods-for-customers) from the preceding step, and lines:

<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/unstable/graphql.json"></script>


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<script data-option="title" data-value="GraphQL query"></script>

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTmutation subscriptionContractAtomicCreate {
  subscriptionContractAtomicCreate(input: {
    customerId: "gid://shopify/Customer/1",
    nextBillingDate: "2024-06-01",
    currencyCode: USD,
    contract: {
      status: ACTIVE,
      paymentMethodId: "gid://shopify/CustomerPaymentMethod/869e7a39",
      billingPolicy: {
        interval: MONTH,
        intervalCount: 1,
        minCycles: 3
      },
      deliveryPolicy: {
        interval: MONTH,
        intervalCount: 1
      },
      deliveryMethod: {
        shipping: {
          address: {
            firstName: "John",
            lastName: "McDonald",
            address1: "33 New Montgomery St",
            address2: "#750",
            city: "San Francisco",
            provinceCode: "CA",
            countryCode: US,
            zip: "94105"
          }
        }
      },
      deliveryPrice: 14.99,
    },
    lines: [
      {
        discounts: [
          {
            recurringCycleLimit: 1,
            title: "Amazing discount",
            value: {
              fixedAmount: {
                amount: 1.1,
                appliesOnEachItem: true
              },
              percentage: 1
            }
          }
        ],
        line: {
          currentPrice: 29.99,
          customAttributes: [
            {
              key: "Type",
              value: "Subscription"
            }
          ],
          pricingPolicy: {
            basePrice: 29.99,
            cycleDiscounts: [
              {
                adjustmentType: FIXED_AMOUNT,
                adjustmentValue: {
                  fixedValue: 29.99,
                  percentage: 1.1
                },
                afterCycle: 1,
                computedPrice: 29.99
              }
            ]
          },
          productVariantId: "gid://shopify/ProductVariant/10079785100",
          quantity: 1,
          sellingPlanId: "gid://shopify/SellingPlan/11988072400",
          sellingPlanName: "Subscribe and save"
        }
      }
    ]
  }) {
    contract {
      id
      lines(first: 10) {
        nodes {
          id
          quantity
        }
      }
    }
    userErrors {
      field
      message
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
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</div>
</div>

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

<script type="text/plain" data-language="json">
RAW_MD_CONTENT{
  "data": {
    "subscriptionContractAtomicCreate": {
      "contract": {
        "id": "gid://shopify/SubscriptionContract/1",
        "lines": {
          "nodes": [
            {
              "id": "gid://shopify/SubscriptionLine/bc43bd4d-59ea-45fa-b276-4bac64ae3c96",
              "quantity": 1
            }
          ]
        }
      },
      "userErrors": []
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


## Step 2: Create billing attempts

You need to create [billing attempts](/docs/apps/build/purchase-options/subscriptions/contracts/build-a-subscription-contract#step-4-create-a-billing-attempt) to trigger the billing schedule of a contract. When billing attempts are successful, Shopify creates an order.

The following mutation makes a billing attempt by specifying the required fields `subscriptionContractId` and `idempotencyKey` (a unique key generated by the client to avoid duplicate payments). In response to a successful mutation, the subscription contract is billed against its current [status](/docs/apps/build/purchase-options/subscriptions/contracts/update-a-subscription-contract#step-1-query-the-available-contracts-on-the-store):

<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/unstable/graphql.json"></script>


<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="title" data-value="GraphQL query"></script>

<script type="text/plain" data-language="graphql">
RAW_MD_CONTENTmutation {
  subscriptionBillingAttemptCreate(
    subscriptionContractId: "gid://shopify/SubscriptionContract/1",
    subscriptionBillingAttemptInput: {
      idempotencyKey: "abc123"
    }
  ) {
    subscriptionBillingAttempt {
      id
      errorMessage
      nextActionUrl
      order {
        id
      }
      ready
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>

<p>
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</div>

</div>
</div>

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

<script type="text/plain" data-language="json">
RAW_MD_CONTENT{
  "data": {
    "subscriptionBillingAttemptCreate": {
      "subscriptionBillingAttempt": {
        "id": "gid://shopify/SubscriptionBillingAttempt/593791910",
        "errorMessage": null,
        "nextActionUrl": null,
        "order": {
          "id": "gid://shopify/Order/148977776"
        },
        "ready": true
      }
    }
  }
}
END_RAW_MD_CONTENT</script>

</div>
</p>


</div>
</p>


For more information on creating billing attempts, refer to [Create a billing attempt](/docs/apps/build/purchase-options/subscriptions/contracts/build-a-subscription-contract#step-4-create-a-billing-attempt).

## Import and bill contracts in bulk

You can also leverage the [`Bulk Operations API`](/docs/api/usage/bulk-operations/imports) to perform these operations on large numbers of contracts without incurring any API limit costs.