{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.com/schemas/omnisend/omnisend-contact-schema.json",
  "title": "Omnisend Contact",
  "description": "Schema for the Omnisend Contact resource exposed by GET/POST/PATCH /contacts and GET/PATCH /contacts/{contactID}.",
  "type": "object",
  "required": ["identifiers"],
  "properties": {
    "contactID": {
      "type": "string",
      "description": "Unique Omnisend identifier for the contact."
    },
    "identifiers": {
      "type": "array",
      "description": "One or more identifiers (email or phone) for the contact, each with channel-specific status and consent.",
      "minItems": 1,
      "items": { "$ref": "#/$defs/Identifier" }
    },
    "firstName": {
      "type": "string",
      "description": "Contact first name."
    },
    "lastName": {
      "type": "string",
      "description": "Contact last name."
    },
    "country": {
      "type": "string",
      "description": "ISO country name for the contact."
    },
    "countryCode": {
      "type": "string",
      "description": "ISO 3166-1 alpha-2 country code.",
      "pattern": "^[A-Z]{2}$"
    },
    "state": {
      "type": "string",
      "description": "State or province."
    },
    "city": {
      "type": "string",
      "description": "City."
    },
    "address": {
      "type": "string",
      "description": "Street address."
    },
    "postalCode": {
      "type": "string"
    },
    "gender": {
      "type": "string",
      "enum": ["f", "m"]
    },
    "birthdate": {
      "type": "string",
      "format": "date"
    },
    "tags": {
      "type": "array",
      "description": "Free-form tags applied to the contact (max 250 per contact).",
      "items": { "type": "string" }
    },
    "segments": {
      "type": "array",
      "description": "Segment IDs the contact currently belongs to (read-only).",
      "items": { "type": "string" }
    },
    "customProperties": {
      "type": "object",
      "description": "Arbitrary custom contact properties.",
      "additionalProperties": true
    },
    "createdAt": {
      "type": "string",
      "format": "date-time"
    },
    "updatedAt": {
      "type": "string",
      "format": "date-time"
    }
  },
  "$defs": {
    "Identifier": {
      "type": "object",
      "required": ["type", "id", "channels"],
      "properties": {
        "type": {
          "type": "string",
          "enum": ["email", "phone"],
          "description": "Channel type for this identifier."
        },
        "id": {
          "type": "string",
          "description": "The address itself — an email for type=email, an E.164 phone number for type=phone."
        },
        "channels": {
          "type": "object",
          "description": "Per-channel subscription state.",
          "properties": {
            "email": { "$ref": "#/$defs/ChannelState" },
            "sms":   { "$ref": "#/$defs/ChannelState" }
          },
          "additionalProperties": false
        }
      }
    },
    "ChannelState": {
      "type": "object",
      "required": ["status"],
      "properties": {
        "status": {
          "type": "string",
          "enum": ["subscribed", "unsubscribed", "nonSubscribed"],
          "description": "Current subscription status for this channel."
        },
        "statusDate": {
          "type": "string",
          "format": "date-time",
          "description": "Timestamp the status last changed."
        }
      }
    }
  }
}