{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.com/schemas/sinch/contact.json",
  "title": "Sinch Contact",
  "description": "Schema representing a contact in the Sinch Conversation API. A contact groups together underlying connected channel recipient identities, enabling omnichannel communication with a single person across SMS, WhatsApp, Messenger, and other channels.",
  "type": "object",
  "required": ["channel_identities"],
  "properties": {
    "id": {
      "type": "string",
      "description": "The unique contact identifier assigned by the platform"
    },
    "display_name": {
      "type": "string",
      "maxLength": 128,
      "description": "The display name of the contact"
    },
    "email": {
      "type": "string",
      "format": "email",
      "description": "The contact email address"
    },
    "external_id": {
      "type": "string",
      "maxLength": 128,
      "description": "An external identifier for cross-referencing with other systems"
    },
    "language": {
      "type": "string",
      "pattern": "^[a-z]{2}(-[A-Z]{2})?$",
      "description": "The preferred language of the contact in BCP 47 format"
    },
    "metadata": {
      "type": "string",
      "maxLength": 1024,
      "description": "Custom metadata associated with the contact"
    },
    "channel_identities": {
      "type": "array",
      "minItems": 1,
      "description": "The channel identities for reaching the contact on various channels",
      "items": {
        "$ref": "#/$defs/ChannelIdentity"
      }
    },
    "channel_priority": {
      "type": "array",
      "description": "Preferred channel order for reaching the contact",
      "items": {
        "type": "string",
        "enum": [
          "SMS", "MMS", "RCS", "WHATSAPP", "MESSENGER", "INSTAGRAM",
          "VIBER", "VIBERBM", "TELEGRAM", "KAKAOTALK", "LINE"
        ]
      }
    }
  },
  "$defs": {
    "ChannelIdentity": {
      "type": "object",
      "description": "A channel-specific identity for reaching the contact",
      "required": ["channel", "identity"],
      "properties": {
        "channel": {
          "type": "string",
          "enum": [
            "SMS", "MMS", "RCS", "WHATSAPP", "MESSENGER", "INSTAGRAM",
            "VIBER", "VIBERBM", "TELEGRAM", "KAKAOTALK", "LINE"
          ],
          "description": "The messaging channel type"
        },
        "identity": {
          "type": "string",
          "description": "The channel-specific identity such as phone number or user ID"
        },
        "app_id": {
          "type": "string",
          "description": "The Conversation API app ID associated with this channel identity"
        }
      }
    }
  }
}