> ## 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 line item quantity and pricing > Updates an existing line item in a subscription contract, modifying quantity, variant, or price. This endpoint allows comprehensive updates to subscription products. **Line Item Update Process:** - **Line Item Identification**: Locates line item using GraphQL line ID - **Quantity Update**: Changes product quantity for recurring orders - **Variant Change**: Can switch to different variant of same product - **Price Override**: Optional custom pricing override - **Contract Sync**: Updates Shopify subscription contract - **Activity Logging**: Records line item modification event **Update Capabilities:** - **Quantity Adjustment**: Increase or decrease product quantity - **Variant Switching**: Change product variant (size, color, flavor, etc.) - **Custom Pricing**: Override standard pricing per line item - **Combined Updates**: Change multiple properties in single request **Parameters:** - **lineId**: GraphQL ID of line item to update - **quantity**: New quantity (must be positive integer) - **variantId**: Product variant ID (can change to different variant) - **price**: Custom price override (optional, overrides default pricing) **Price Override:** - Allows custom per-line pricing - Useful for special pricing arrangements - Overrides default product pricing - Price in shop's base currency **Use Cases:** - Customer increases/decreases product quantity - Switch product variant (e.g., Medium → Large roast) - Special pricing for VIP customers - Seasonal variant changes (Summer → Winter flavor) - Customer portal quantity adjustments - Wholesale pricing overrides - Build-a-box quantity modifications **Important Notes:** - Quantity must be positive (use remove-line-item to delete) - Variant must be valid and available - Price updates don't affect existing discount percentages - Changes apply to next billing cycle **Returns:** Updated subscription contract object with modified line item **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-line-item 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-line-item: put: tags: - Membership Contracts summary: Update subscription line item quantity and pricing description: >- Updates an existing line item in a subscription contract, modifying quantity, variant, or price. This endpoint allows comprehensive updates to subscription products. **Line Item Update Process:** - **Line Item Identification**: Locates line item using GraphQL line ID - **Quantity Update**: Changes product quantity for recurring orders - **Variant Change**: Can switch to different variant of same product - **Price Override**: Optional custom pricing override - **Contract Sync**: Updates Shopify subscription contract - **Activity Logging**: Records line item modification event **Update Capabilities:** - **Quantity Adjustment**: Increase or decrease product quantity - **Variant Switching**: Change product variant (size, color, flavor, etc.) - **Custom Pricing**: Override standard pricing per line item - **Combined Updates**: Change multiple properties in single request **Parameters:** - **lineId**: GraphQL ID of line item to update - **quantity**: New quantity (must be positive integer) - **variantId**: Product variant ID (can change to different variant) - **price**: Custom price override (optional, overrides default pricing) **Price Override:** - Allows custom per-line pricing - Useful for special pricing arrangements - Overrides default product pricing - Price in shop's base currency **Use Cases:** - Customer increases/decreases product quantity - Switch product variant (e.g., Medium → Large roast) - Special pricing for VIP customers - Seasonal variant changes (Summer → Winter flavor) - Customer portal quantity adjustments - Wholesale pricing overrides - Build-a-box quantity modifications **Important Notes:** - Quantity must be positive (use remove-line-item to delete) - Variant must be valid and available - Price updates don't affect existing discount percentages - Changes apply to next billing cycle **Returns:** Updated subscription contract object with modified line item **Authentication:** Requires API key authentication via X-API-Key header or api_key parameter operationId: updateLineItemV2 parameters: - description: Subscription contract ID 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 - description: New quantity for the line item example: 3 in: query name: quantity required: true schema: format: int32 type: integer - description: Product variant ID (can be different variant) example: 12345678 in: query name: variantId required: true schema: type: string - description: Line item GraphQL ID to update example: gid://shopify/SubscriptionLine/987654321 in: query name: lineId required: true schema: type: string - description: Custom price override (optional) example: 29.99 in: query name: price required: true schema: format: double type: number responses: '200': content: application/json: schema: $ref: '#/components/schemas/SubscriptionContract' description: Line item successfully updated '400': content: '*/*': schema: $ref: '#/components/schemas/SubscriptionContract' description: Invalid quantity, variant, or price '401': content: '*/*': schema: $ref: '#/components/schemas/SubscriptionContract' description: Authentication required - invalid or missing API key '404': content: '*/*': schema: $ref: '#/components/schemas/SubscriptionContract' description: Subscription contract, line item, or variant not found '500': content: '*/*': schema: $ref: '#/components/schemas/SubscriptionContract' description: Shopify API error during line item update components: schemas: SubscriptionContract: properties: billingAttempts: $ref: '#/components/schemas/BillingAttempts' billingPolicy: $ref: '#/components/schemas/BillingPolicy' createdAt: type: object customAttributes: items: $ref: '#/components/schemas/CustomAttribute1' type: array customer: $ref: '#/components/schemas/Customer' customerPaymentMethod: $ref: '#/components/schemas/CustomerPaymentMethod' deliveryMethod: $ref: '#/components/schemas/DeliveryMethod' deliveryPolicy: $ref: '#/components/schemas/DeliveryPolicy' deliveryPrice: $ref: '#/components/schemas/DeliveryPrice' discounts: $ref: '#/components/schemas/Discounts' get__typename: type: string id: type: string lastPaymentStatus: enum: - SUCCEEDED - FAILED - $UNKNOWN type: string lines: $ref: '#/components/schemas/Lines' nextBillingDate: type: object note: type: string originOrder: $ref: '#/components/schemas/OriginOrder' status: enum: - ACTIVE - PAUSED - CANCELLED - EXPIRED - FAILED - $UNKNOWN type: string updatedAt: type: object type: object BillingAttempts: properties: get__typename: type: string nodes: items: $ref: '#/components/schemas/Node3' type: array type: object BillingPolicy: properties: anchors: items: $ref: '#/components/schemas/Anchor' type: array get__typename: type: string interval: enum: - DAY - WEEK - MONTH - YEAR - $UNKNOWN type: string intervalCount: format: int32 type: integer maxCycles: format: int32 type: integer minCycles: format: int32 type: integer type: object CustomAttribute1: properties: get__typename: type: string key: type: string value: type: string type: object Customer: properties: displayName: type: string email: deprecated: true type: string firstName: type: string get__typename: type: string id: type: string lastName: type: string phone: deprecated: true type: string type: object CustomerPaymentMethod: properties: get__typename: type: string id: type: string instrument: $ref: '#/components/schemas/Instrument' revokedAt: type: object revokedReason: enum: - AUTHORIZE_NET_GATEWAY_NOT_ENABLED - AUTHORIZE_NET_RETURNED_NO_PAYMENT_METHOD - FAILED_TO_UPDATE_CREDIT_CARD - STRIPE_API_AUTHENTICATION_ERROR - STRIPE_API_INVALID_REQUEST_ERROR - STRIPE_GATEWAY_NOT_ENABLED - STRIPE_RETURNED_NO_PAYMENT_METHOD - STRIPE_PAYMENT_METHOD_NOT_CARD - BRAINTREE_API_AUTHENTICATION_ERROR - BRAINTREE_GATEWAY_NOT_ENABLED - BRAINTREE_RETURNED_NO_PAYMENT_METHOD - BRAINTREE_PAYMENT_METHOD_NOT_CARD - PAYMENT_METHOD_VERIFICATION_FAILED - THREE_D_SECURE_FLOW_IN_VERIFICATION_NOT_IMPLEMENTED - MANUALLY_REVOKED - FAILED_TO_RETRIEVE_BILLING_ADDRESS - MERGED - CUSTOMER_REDACTED - TOO_MANY_CONSECUTIVE_FAILURES - CVV_ATTEMPTS_LIMIT_EXCEEDED - $UNKNOWN type: string type: object DeliveryMethod: properties: additionalInformation: $ref: '#/components/schemas/AdditionalInformation' brandedPromise: $ref: '#/components/schemas/BrandedPromise' get__typename: type: string id: type: string maxDeliveryDateTime: type: object methodType: enum: - SHIPPING - PICK_UP - NONE - RETAIL - LOCAL - PICKUP_POINT - $UNKNOWN type: string minDeliveryDateTime: type: object serviceCode: type: string type: object DeliveryPolicy: properties: anchors: items: $ref: '#/components/schemas/Anchor1' type: array get__typename: type: string interval: enum: - DAY - WEEK - MONTH - YEAR - $UNKNOWN type: string intervalCount: format: int32 type: integer type: object DeliveryPrice: properties: amount: type: object currencyCode: enum: - USD - EUR - GBP - CAD - AFN - ALL - DZD - AOA - ARS - AMD - AWG - AUD - BBD - AZN - BDT - BSD - BHD - BIF - BYN - BZD - BMD - BTN - BAM - BRL - BOB - BWP - BND - BGN - MMK - KHR - CVE - KYD - XAF - CLP - CNY - COP - KMF - CDF - CRC - HRK - CZK - DKK - DJF - DOP - XCD - EGP - ERN - ETB - FKP - XPF - FJD - GIP - GMD - GHS - GTQ - GYD - GEL - GNF - HTG - HNL - HKD - HUF - ISK - INR - IDR - ILS - IRR - IQD - JMD - JPY - JEP - JOD - KZT - KES - KID - KWD - KGS - LAK - LVL - LBP - LSL - LRD - LYD - LTL - MGA - MKD - MOP - MWK - MVR - MRU - MXN - MYR - MUR - MDL - MAD - MNT - MZN - NAD - NPR - ANG - NZD - NIO - NGN - NOK - OMR - PAB - PKR - PGK - PYG - PEN - PHP - PLN - QAR - RON - RUB - RWF - WST - SHP - SAR - RSD - SCR - SLL - SGD - SDG - SOS - SYP - ZAR - KRW - SSP - SBD - LKR - SRD - SZL - SEK - CHF - TWD - THB - TJS - TZS - TOP - TTD - TND - TRY - TMT - UGX - UAH - AED - UYU - UZS - VUV - VES - VND - XOF - YER - ZMW - USDC - BYR - STD - STN - VED - VEF - XXX - $UNKNOWN type: string get__typename: type: string type: object Discounts: properties: get__typename: type: string nodes: items: $ref: '#/components/schemas/Node2' type: array pageInfo: $ref: '#/components/schemas/PageInfo2' type: object Lines: properties: get__typename: type: string nodes: items: $ref: '#/components/schemas/Node' type: array pageInfo: $ref: '#/components/schemas/PageInfo' type: object OriginOrder: properties: fulfillmentOrders: $ref: '#/components/schemas/FulfillmentOrders' get__typename: type: string id: type: string name: type: string type: object Node3: properties: completedAt: type: object createdAt: type: object get__typename: type: string id: type: string idempotencyKey: type: string ready: deprecated: true type: boolean type: object Anchor: properties: cutoffDay: format: int32 type: integer day: format: int32 type: integer get__typename: type: string month: format: int32 type: integer type: enum: - WEEKDAY - MONTHDAY - YEARDAY - $UNKNOWN type: string type: object Instrument: properties: get__typename: type: string type: object AdditionalInformation: properties: get__typename: type: string instructions: type: string type: object BrandedPromise: properties: get__typename: type: string handle: type: string name: type: string type: object Anchor1: properties: cutoffDay: format: int32 type: integer day: format: int32 type: integer get__typename: type: string month: format: int32 type: integer type: enum: - WEEKDAY - MONTHDAY - YEARDAY - $UNKNOWN type: string type: object Node2: properties: createdAt: type: object deliveredAt: type: object displayStatus: enum: - ATTEMPTED_DELIVERY - CANCELED - CONFIRMED - DELAYED - DELIVERED - FAILURE - FULFILLED - CARRIER_PICKED_UP - IN_TRANSIT - LABEL_PRINTED - LABEL_PURCHASED - LABEL_VOIDED - MARKED_AS_FULFILLED - NOT_DELIVERED - OUT_FOR_DELIVERY - READY_FOR_PICKUP - PICKED_UP - SUBMITTED - $UNKNOWN type: string estimatedDeliveryAt: type: object get__typename: type: string id: type: string inTransitAt: type: object name: type: string requiresShipping: type: boolean service: $ref: '#/components/schemas/Service' status: enum: - PENDING - OPEN - SUCCESS - CANCELLED - ERROR - FAILURE - $UNKNOWN type: string trackingInfo: items: $ref: '#/components/schemas/TrackingInfo' type: array type: object PageInfo2: properties: endCursor: type: string get__typename: type: string hasNextPage: type: boolean hasPreviousPage: type: boolean startCursor: type: string type: object Node: properties: get__typename: type: string type: object PageInfo: properties: endCursor: type: string get__typename: type: string hasNextPage: type: boolean hasPreviousPage: type: boolean startCursor: type: string type: object FulfillmentOrders: properties: get__typename: type: string nodes: items: $ref: '#/components/schemas/Node' type: array pageInfo: $ref: '#/components/schemas/PageInfo2' type: object Service: properties: get__typename: type: string handle: type: string serviceName: type: string type: enum: - GIFT_CARD - MANUAL - THIRD_PARTY - $UNKNOWN type: string type: object TrackingInfo: properties: company: type: string get__typename: type: string number: type: string url: type: object type: object ````