curl -X GET https://api.livchat.ai/v1/contacts/list \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "success": true,
  "code": 200,
  "data": {
    "5511999999999@s.whatsapp.net": {
      "businessName": "",
      "firstName": "John",
      "found": true,
      "fullName": "John Doe",
      "pushName": "Johnny"
    },
    "5511888888888@s.whatsapp.net": {
      "businessName": "ACME Corp",
      "firstName": "",
      "found": true,
      "fullName": "",
      "pushName": "ACME Support"
    }
  }
}