{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Product Variant",
  "description": "Product variant",
  "type": "object",
  "properties": {
    "id": {
      "description": "Unique system-generated identifier for this entity (read-only)",
      "type": "string"
    },
    "externalId": {
      "description": "ID of the entity in the client's system. Must be unique within the tenant.",
      "type": "string"
    },
    "createdAt": {
      "description": "ISO 8601 timestamp when the entity was created (read-only)",
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$"
    },
    "updatedAt": {
      "description": "ISO 8601 timestamp when the entity was last updated (read-only)",
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z))$"
    },
    "tenantId": {
      "description": "Unique identifier for the tenant that owns this entity (read-only)",
      "type": "string"
    },
    "productId": {
      "description": "ID of the parent product",
      "type": "string"
    },
    "externalProductId": {
      "description": "External product identifier when provided alongside a distinct variant externalId",
      "type": "string"
    },
    "sku": {
      "description": "Variant SKU or stock keeping unit",
      "type": "string"
    },
    "barcode": {
      "description": "General barcode or GTIN value; use `upc` when a UPC-format code is available",
      "type": "string"
    },
    "upc": {
      "description": "UPC-format code; when present it overrides any product-level default for this variant",
      "type": "string"
    },
    "title": {
      "description": "Variant display name",
      "type": "string"
    },
    "selectedOptions": {
      "description": "Selected option values describing this variant",
      "type": "array",
      "items": {
        "description": "Specific option selections for a product variant",
        "type": "object",
        "properties": {
          "name": {
            "description": "Name of the option dimension selected by this variant, e.g. Size",
            "type": "string"
          },
          "value": {
            "description": "Value for the option dimension, e.g. Medium",
            "type": "string"
          }
        },
        "required": [
          "name",
          "value"
        ],
        "additionalProperties": false
      }
    },
    "price": {
      "description": "Current selling price for the variant",
      "type": "number"
    },
    "currency": {
      "description": "ISO currency code for the price",
      "type": "string"
    },
    "compareAtPrice": {
      "description": "List or compare-at price, if available",
      "type": "number"
    },
    "cost": {
      "description": "Unit cost attributed to this variant",
      "type": "number"
    },
    "costCurrency": {
      "description": "Currency for the unit cost",
      "type": "string"
    },
    "inventoryNotTracked": {
      "type": "boolean"
    },
    "weight": {
      "type": "object",
      "properties": {
        "value": {
          "type": "number"
        },
        "unit": {
          "type": "string",
          "enum": [
            "lb",
            "oz",
            "kg",
            "g"
          ]
        }
      },
      "required": [
        "value",
        "unit"
      ],
      "additionalProperties": false
    },
    "dimensions": {
      "type": "object",
      "properties": {
        "length": {
          "type": "number"
        },
        "width": {
          "type": "number"
        },
        "height": {
          "type": "number"
        },
        "unit": {
          "type": "string",
          "enum": [
            "cm",
            "in",
            "ft"
          ]
        }
      },
      "required": [
        "length",
        "width",
        "height",
        "unit"
      ],
      "additionalProperties": false
    },
    "imageURLs": {
      "description": "Publicly accessible HTTP URLs for images of the variant. First image should be the primary image.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri"
      }
    },
    "taxable": {
      "type": "boolean"
    },
    "tags": {
      "description": "Tags for categorization and filtering. Useful for organizing entities with custom labels (e.g., \"priority\", \"wholesale\", \"gift\")",
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "customFields": {
      "description": "Custom Fields - allows for arbitrary key-value pairs to be added to an entity. Useful for storing any custom data that is not covered by the other fields.",
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "value": {
            "type": "string"
          }
        },
        "required": [
          "name",
          "value"
        ],
        "additionalProperties": false
      }
    }
  },
  "required": [
    "id",
    "createdAt",
    "updatedAt",
    "tenantId",
    "productId",
    "sku"
  ],
  "additionalProperties": false
}