> ## 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 custom note attributes on subscription contract > Updates custom note attributes (key-value pairs) on a subscription contract. These attributes are stored on the Shopify subscription contract and propagated to recurring orders. **Modes:** - `overwriteExistingAttributes=true` (default): Replaces all existing note attributes with the provided list - `overwriteExistingAttributes=false`: Merges provided attributes with existing ones (updates matching keys, adds new ones) **Use Cases:** - Clear tracking pixel IDs from recurring orders - Update order-level metadata - Store custom order instructions **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-custom-note-attributes 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-custom-note-attributes: put: tags: - Membership Contracts summary: Update custom note attributes on subscription contract description: >- Updates custom note attributes (key-value pairs) on a subscription contract. These attributes are stored on the Shopify subscription contract and propagated to recurring orders. **Modes:** - `overwriteExistingAttributes=true` (default): Replaces all existing note attributes with the provided list - `overwriteExistingAttributes=false`: Merges provided attributes with existing ones (updates matching keys, adds new ones) **Use Cases:** - Clear tracking pixel IDs from recurring orders - Update order-level metadata - Store custom order instructions **Authentication:** Requires API key authentication via X-API-Key header or api_key parameter operationId: updateOrderNoteAttributesV2 parameters: - deprecated: true description: API Key (Deprecated) in: query name: api_key required: false schema: type: string - description: API Key in: header name: X-API-Key required: true schema: type: string - description: >- When true (default), replaces all existing attributes. When false, merges with existing attributes. in: query name: overwriteExistingAttributes required: false schema: default: true type: boolean requestBody: content: application/json: schema: $ref: '#/components/schemas/UpdateAttributesRequest' required: true responses: '200': description: Note attributes successfully updated '400': description: Invalid request or contract not found '401': description: Authentication required - invalid or missing API key components: schemas: UpdateAttributesRequest: description: Request to update custom attributes on a subscription contract properties: customAttributesList: description: >- List of custom attributes to set on the subscription contract. Each attribute is a key-value pair that will be stored with the subscription. items: $ref: '#/components/schemas/OrderNoteAttribute' type: array subscriptionContractId: description: The ID of the subscription contract to update example: 123456789 format: int64 type: integer required: - customAttributesList - subscriptionContractId type: object OrderNoteAttribute: description: A custom attribute consisting of a key and value properties: key: description: >- The attribute key. Should be a unique identifier for this attribute. Use descriptive keys like 'gift_message', 'delivery_instructions', etc. example: gift_message type: string value: description: >- The attribute value. Can be any string value including JSON-encoded data. Set to empty string to clear an attribute. example: Happy Birthday! Enjoy your subscription! type: string required: - key type: object ````