> ## 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. # Update subscription payment method > Updates the payment method for a subscription contract by refreshing payment instrument from Shopify customer. This endpoint syncs the subscription's payment method with the customer's default payment method in Shopify. **Payment Method Update Process:** - **Fetch Latest Payment**: Retrieves customer's current default payment method from Shopify - **Update Contract**: Associates new payment method with subscription contract - **Validate Payment**: Ensures payment method is valid and active - **Sync Changes**: Updates payment instrument in subscription billing system **Key Features:** - **Automatic Sync**: Pulls latest payment method from Shopify customer record - **Payment Validation**: Verifies new payment method is usable for billing - **Contract Update**: Updates Shopify subscription contract with new payment - **Failed Billing Recovery**: Useful for updating payment after billing failures **Use Cases:** - Customer updates credit card and wants to apply to existing subscription - Recover from failed billing by allowing payment method update - Sync payment methods in customer portal workflows - Update expired or invalid payment methods - Switch between multiple saved payment methods - Integration with custom payment update flows **Important Notes:** - Customer must have a default payment method in Shopify - Payment method must be valid and not expired - Updates are reflected immediately for future billing - Does not retry failed billing attempts automatically **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 managing Shopify delivery profiles, shipping rates, zones, and free shipping configuration for subscription memberships name: Shipping & Delivery Profiles - description: >- APIs for retrieving historical discount code usage and redemption information for membership contracts name: Customer Discount History - 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 one-time product additions to upcoming subscription orders, including adding, retrieving, and removing one-off items name: One-Time Add-Ons - description: >- APIs for managing membership/subscription plan groups, including creating plans, configuring discounts, billing intervals, and assigning products to plans name: Membership Plans - description: >- APIs for managing subscription product bundles, bundle configurations, item grouping, and bundle-specific discount codes name: Product Bundles - description: >- APIs for retrieving custom CSS styles applied to subscription widgets and customer portal for theme customization name: Custom CSS Styling - 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 managing membership/subscription contracts including creation, updates, status changes, line items, discounts, and billing operations name: Membership Contracts - description: >- APIs for managing subscription bundle configuration settings including bundle behavior, pricing rules, and display options name: Bundle Settings - description: >- APIs for managing customer payment methods, payment tokens, and payment method retrieval for subscriptions name: Customer Payment Methods - description: >- APIs for retrieving product swap/substitution options allowing members to exchange subscription items based on configured swap rules and variant groups name: Product Swap Rules - description: >- APIs for retrieving product catalog, variants, pricing, and inventory information for subscription 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: Update subscription payment method description: >- Updates the payment method for a subscription contract by refreshing payment instrument from Shopify customer. This endpoint syncs the subscription's payment method with the customer's default payment method in Shopify. **Payment Method Update Process:** - **Fetch Latest Payment**: Retrieves customer's current default payment method from Shopify - **Update Contract**: Associates new payment method with subscription contract - **Validate Payment**: Ensures payment method is valid and active - **Sync Changes**: Updates payment instrument in subscription billing system **Key Features:** - **Automatic Sync**: Pulls latest payment method from Shopify customer record - **Payment Validation**: Verifies new payment method is usable for billing - **Contract Update**: Updates Shopify subscription contract with new payment - **Failed Billing Recovery**: Useful for updating payment after billing failures **Use Cases:** - Customer updates credit card and wants to apply to existing subscription - Recover from failed billing by allowing payment method update - Sync payment methods in customer portal workflows - Update expired or invalid payment methods - Switch between multiple saved payment methods - Integration with custom payment update flows **Important Notes:** - Customer must have a default payment method in Shopify - Payment method must be valid and not expired - Updates are reflected immediately for future billing - Does not retry failed billing attempts automatically **Authentication:** Requires API key authentication via X-API-Key header or api_key parameter operationId: updatePaymentMethodV2 parameters: - description: Subscription 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: Payment method successfully updated for subscription '400': description: Invalid contract ID or no valid payment method found '401': description: Authentication required - invalid or missing API key '404': description: Subscription contract not found '500': description: Shopify API error during payment method update ````