{
  "title": "Sinch Contact Structure",
  "description": "Documentation of the contact data structure in the Sinch Conversation API",
  "type": "object",
  "fields": [
    {
      "name": "id",
      "type": "string",
      "required": true,
      "description": "Unique contact identifier assigned by Sinch"
    },
    {
      "name": "channel_identities",
      "type": "array",
      "required": true,
      "description": "List of channel-specific identities for this contact"
    },
    {
      "name": "channel_identities[].channel",
      "type": "enum",
      "required": true,
      "values": ["SMS", "RCS", "WHATSAPP", "MESSENGER", "INSTAGRAM", "VIBER", "TELEGRAM", "KAKAOTALK", "LINE"],
      "description": "The messaging channel"
    },
    {
      "name": "channel_identities[].identity",
      "type": "string",
      "required": true,
      "description": "Channel-specific identity (e.g., phone number for SMS)"
    },
    {
      "name": "display_name",
      "type": "string",
      "required": false,
      "description": "Human-readable display name for the contact"
    },
    {
      "name": "email",
      "type": "string",
      "required": false,
      "description": "Contact email address"
    },
    {
      "name": "external_id",
      "type": "string",
      "required": false,
      "description": "External system identifier for the contact"
    },
    {
      "name": "metadata",
      "type": "string",
      "required": false,
      "description": "Custom metadata string for the contact"
    }
  ]
}