curl --request GET \
  --url https://api.gptmaker.ai/v2/workspace/{workspaceId}/contact/{contactId} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "name": "<string>",
  "birthday": 123,
  "gender": "<string>",
  "picture": "<string>",
  "phone": "<string>",
  "email": "[email protected]",
  "jobTitle": "<string>",
  "recipient": "<string>",
  "customFieldValues": [
    {
      "customFieldId": "<string>",
      "value": "<string>"
    }
  ]
}