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.

Full behavior, validation rules, and side effects

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

PUT /api/external/v2/subscription-contracts-update-line-item

Update subscription line item quantity and pricing

cURL

curl --request PUT \
  --url https://membership-admin.appstle.com/api/external/v2/subscription-contracts-update-line-item

200

{
  "get__typename": "<string>",
  "id": "<string>",
  "createdAt": {},
  "updatedAt": {},
  "nextBillingDate": {},
  "deliveryPrice": {
    "get__typename": "<string>",
    "amount": {}
  },
  "billingPolicy": {
    "get__typename": "<string>",
    "intervalCount": 123,
    "anchors": [
      {
        "get__typename": "<string>",
        "cutoffDay": 123,
        "day": 123,
        "month": 123
      }
    ],
    "maxCycles": 123,
    "minCycles": 123
  },
  "deliveryPolicy": {
    "get__typename": "<string>",
    "intervalCount": 123,
    "anchors": [
      {
        "get__typename": "<string>",
        "cutoffDay": 123,
        "day": 123,
        "month": 123
      }
    ]
  },
  "lines": {
    "get__typename": "<string>",
    "nodes": [
      {
        "get__typename": "<string>"
      }
    ],
    "pageInfo": {
      "get__typename": "<string>",
      "hasPreviousPage": true,
      "hasNextPage": true,
      "startCursor": "<string>",
      "endCursor": "<string>"
    }
  },
  "customerPaymentMethod": {
    "get__typename": "<string>",
    "id": "<string>",
    "instrument": {
      "get__typename": "<string>"
    },
    "revokedAt": {}
  },
  "deliveryMethod": {
    "get__typename": "<string>",
    "id": "<string>",
    "serviceCode": "<string>",
    "minDeliveryDateTime": {},
    "maxDeliveryDateTime": {},
    "additionalInformation": {
      "get__typename": "<string>",
      "instructions": "<string>"
    },
    "brandedPromise": {
      "get__typename": "<string>",
      "handle": "<string>",
      "name": "<string>"
    }
  },
  "originOrder": {
    "get__typename": "<string>",
    "id": "<string>",
    "name": "<string>",
    "fulfillmentOrders": {
      "get__typename": "<string>",
      "nodes": [
        {
          "get__typename": "<string>"
        }
      ],
      "pageInfo": {
        "get__typename": "<string>",
        "hasPreviousPage": true,
        "hasNextPage": true,
        "startCursor": "<string>",
        "endCursor": "<string>"
      }
    }
  },
  "customer": {
    "get__typename": "<string>",
    "id": "<string>",
    "email": "<string>",
    "displayName": "<string>",
    "firstName": "<string>",
    "lastName": "<string>",
    "phone": "<string>"
  },
  "discounts": {
    "get__typename": "<string>",
    "nodes": [
      {
        "get__typename": "<string>",
        "createdAt": {},
        "deliveredAt": {},
        "estimatedDeliveryAt": {},
        "id": "<string>",
        "inTransitAt": {},
        "name": "<string>",
        "requiresShipping": true,
        "service": {
          "get__typename": "<string>",
          "handle": "<string>",
          "serviceName": "<string>"
        },
        "trackingInfo": [
          {
            "get__typename": "<string>",
            "url": {},
            "number": "<string>",
            "company": "<string>"
          }
        ]
      }
    ],
    "pageInfo": {
      "get__typename": "<string>",
      "hasPreviousPage": true,
      "hasNextPage": true,
      "startCursor": "<string>",
      "endCursor": "<string>"
    }
  },
  "note": "<string>",
  "customAttributes": [
    {
      "get__typename": "<string>",
      "key": "<string>",
      "value": "<string>"
    }
  ],
  "billingAttempts": {
    "get__typename": "<string>",
    "nodes": [
      {
        "get__typename": "<string>",
        "completedAt": {},
        "createdAt": {},
        "id": "<string>",
        "idempotencyKey": "<string>",
        "ready": true
      }
    ]
  }
}

Headers

X-API-Key · string

Query Parameters

contractId · integer<int64> · required

Subscription contract ID

api_key · string

API Key (Deprecated - Use Header X-API-Key instead)

quantity · integer<int32> · required

New quantity for the line item

variantId · string · required

Product variant ID (can be different variant)

lineId · string · required

Line item GraphQL ID to update

price · number<double> · required

Custom price override (optional)

Response

200

application/json

Line item successfully updated

get__typename · string

id · string

createdAt · object

updatedAt · object

nextBillingDate · object

status · enum<string>

Available options: ACTIVE, PAUSED, CANCELLED, EXPIRED, FAILED, $UNKNOWN

deliveryPrice · object

Show child attributes

lastPaymentStatus · enum<string>

Available options: SUCCEEDED, FAILED, $UNKNOWN

billingPolicy · object

Show child attributes

deliveryPolicy · object

Show child attributes

lines · object

Show child attributes

customerPaymentMethod · object

Show child attributes

deliveryMethod · object

Show child attributes

originOrder · object

Show child attributes

customer · object

Show child attributes

discounts · object

Show child attributes

note · string

customAttributes · object[]

Show child attributes

billingAttempts · object

Show child attributes