{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/BillingSubscriptionChange",
  "title": "BillingSubscriptionChange",
  "description": "Request for changing a subscription.",
  "type": "object",
  "properties": {
    "labels": {
      "$ref": "#/components/schemas/Labels"
    },
    "customer": {
      "description": "The customer to create the subscription for.",
      "type": "object",
      "properties": {
        "id": {
          "description": "The ID of the customer to create the subscription for.\n\nEither customer ID or customer key must be provided.\nIf both are provided, the ID will be used.",
          "type": "string",
          "example": "01G65Z755AFWAKHE12NY0CQ9FH",
          "pattern": "^[0-7][0-9A-HJKMNP-TV-Z]{25}$",
          "title": "Customer ID"
        },
        "key": {
          "description": "The key of the customer to create the subscription for.\n\nEither customer ID or customer key must be provided.\nIf both are provided, the ID will be used.",
          "type": "string",
          "example": "019ae40f-4258-7f15-9491-842f42a7d6ac",
          "maxLength": 256,
          "minLength": 1,
          "title": "Customer Key"
        }
      }
    },
    "plan": {
      "description": "The plan reference of the subscription.",
      "type": "object",
      "properties": {
        "id": {
          "description": "The plan ID of the subscription.\nSet if subscription is created from a plan.\n\nID or Key of the plan is required if creating a subscription from a plan.\nIf both are provided, the ID will be used.",
          "type": "string",
          "example": "01G65Z755AFWAKHE12NY0CQ9FH",
          "pattern": "^[0-7][0-9A-HJKMNP-TV-Z]{25}$",
          "title": "Plan ID"
        },
        "key": {
          "description": "The plan Key of the subscription, if any.\nSet if subscription is created from a plan.\n\nID or Key of the plan is required if creating a subscription from a plan.\nIf both are provided, the ID will be used.",
          "type": "string",
          "example": "resource_key",
          "maxLength": 64,
          "minLength": 1,
          "pattern": "^[a-z0-9]+(?:_[a-z0-9]+)*$",
          "title": "Plan Key"
        },
        "version": {
          "description": "The plan version of the subscription, if any.\nIf not provided, the latest version of the plan will be used.",
          "type": "integer",
          "title": "Plan Version"
        }
      }
    },
    "billing_anchor": {
      "description": "A billing anchor is the fixed point in time that determines the subscription's recurring billing cycle.\nIt affects when charges occur and how prorations are calculated.\nCommon anchors:\n- Calendar month (1st of each month): `2025-01-01T00:00:00Z`\n- Subscription anniversary (day customer signed up)\n- Custom date (customer-specified day)\n\nIf not provided, the subscription will be created with the subscription's creation time as the billing anchor.",
      "type": "string",
      "format": "date-time",
      "example": "2023-01-01T01:01:01.001Z",
      "title": "Billing anchor"
    },
    "timing": {
      "description": "Timing configuration for the change, when the change should take effect.\nFor changing a subscription, the accepted values depend on the subscription configuration.",
      "example": "immediate",
      "oneOf": [
        {
          "$ref": "#/components/schemas/BillingSubscriptionEditTimingEnum"
        },
        {
          "$ref": "#/components/schemas/DateTime"
        }
      ]
    }
  },
  "required": [
    "customer",
    "plan",
    "timing"
  ]
}