> ## Documentation Index > Fetch the complete documentation index at: https://developers.appstle.com/llms.txt > Use this file to discover all available pages before exploring further. # Send payment method update email > Asks Shopify to email the member a secure link to update the payment method on this membership. The payment method changes only when the member follows the link and saves new details, so a 200 response means Shopify accepted the email request, not that the payment method changed. **How it works:** - **Finds the membership's payment method**: Looks up the payment method attached to this membership contract in Shopify - **Requests Shopify's update email**: Shopify emails the member a secure link to update that payment method - **Changes nothing itself**: The call does not change the membership's payment method, and it does not read the customer's default payment method in Shopify **Use Cases:** - Ask a member whose card is expiring or has expired to update it - Follow up after a failed renewal. The call does not retry the billing attempt **Important Notes:** - The membership must have an active payment method. If Shopify has revoked it, the call returns 400 and no email is sent - The call does not check the membership's status. It also returns 200 for a cancelled membership whose payment method is still on file - Each successful call asks Shopify for another email, so don't retry a call that returned 200 - Shopify sends the email, not the app, so the app's email templates don't apply and the call takes no subject or message **Authentication:** Requires API key authentication via X-API-Key header or api_key parameter ## OpenAPI ````yaml /memberships/admin-api-swagger.json put /api/external/v2/subscription-contracts-update-payment-method openapi: 3.0.1 info: description: >- Comprehensive API documentation for managing memberships, payments, and related operations. These APIs allow you to programmatically manage membership lifecycles, handle payments, configure products, and integrate membership functionality into your applications. title: Admin APIs version: 0.0.1 servers: - url: https://membership-admin.appstle.com security: [] tags: - description: >- APIs for retrieving product swap/substitution options allowing members to exchange membership items based on configured swap rules and variant groups name: Product Swap Rules - description: >- APIs for managing customer payment methods, payment tokens, and payment method retrieval for memberships name: Customer Payment Methods - description: >- APIs for managing one-time product additions to upcoming membership orders, including adding, retrieving, and removing one-off items name: One-Time Add-Ons - description: >- APIs for managing membership contracts including creation, updates, status changes, line items, discounts, and billing operations name: Membership Contracts - description: >- APIs for retrieving historical discount code usage and redemption information for membership contracts name: Customer Discount History - description: >- APIs for managing customer portal settings including UI customization, text labels, feature toggles, and branding options for the member self-service portal name: Customer Portal Configuration - description: >- APIs for retrieving custom CSS styles applied to membership widgets and customer portal for theme customization name: Custom CSS Styling - description: >- APIs for managing membership cancellation flow settings including retention offers, survey questions, and cancel confirmation screens name: Cancellation Flow Configuration - description: >- APIs for managing membership billing attempts, recurring orders, payment retries, order history, and order skipping name: Billing & Orders - description: >- APIs for managing Shopify delivery profiles, shipping rates, zones, and free shipping configuration for membership memberships name: Shipping & Delivery Profiles - description: >- APIs for managing membership plan groups, including creating plans, configuring discounts, billing intervals, and assigning products to plans name: Membership Plans - description: >- APIs for retrieving product catalog, variants, pricing, and inventory information for memberships. name: Product & Inventory Data - description: >- APIs for managing shop-level membership settings, configuration, and general store information. name: Shop Settings - description: >- APIs for performing bulk/mass operations on multiple membership contracts including status updates, product replacements, and billing date changes. name: Bulk Operations paths: /api/external/v2/subscription-contracts-update-payment-method: put: tags: - Membership Contracts summary: Send payment method update email description: >- Asks Shopify to email the member a secure link to update the payment method on this membership. The payment method changes only when the member follows the link and saves new details, so a 200 response means Shopify accepted the email request, not that the payment method changed. **How it works:** - **Finds the membership's payment method**: Looks up the payment method attached to this membership contract in Shopify - **Requests Shopify's update email**: Shopify emails the member a secure link to update that payment method - **Changes nothing itself**: The call does not change the membership's payment method, and it does not read the customer's default payment method in Shopify **Use Cases:** - Ask a member whose card is expiring or has expired to update it - Follow up after a failed renewal. The call does not retry the billing attempt **Important Notes:** - The membership must have an active payment method. If Shopify has revoked it, the call returns 400 and no email is sent - The call does not check the membership's status. It also returns 200 for a cancelled membership whose payment method is still on file - Each successful call asks Shopify for another email, so don't retry a call that returned 200 - Shopify sends the email, not the app, so the app's email templates don't apply and the call takes no subject or message **Authentication:** Requires API key authentication via X-API-Key header or api_key parameter operationId: updatePaymentMethodV2 parameters: - description: Membership contract ID to update payment method for example: 123456789 in: query name: contractId required: true schema: format: int64 type: integer - description: API Key (Deprecated - Use Header X-API-Key instead) in: query name: api_key required: false schema: type: string - in: header name: X-API-Key required: false schema: type: string responses: '200': description: >- Shopify accepted the request to email the member a link to update the payment method. The payment method has not changed yet '400': description: >- Contract does not exist, the membership has no active payment method, or Shopify refused to send the email '401': description: Authentication required - invalid or missing API key '500': description: Unexpected error while asking Shopify to send the email ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.