curl --request PUT \
  --url https://api.gptmaker.ai/v2/contact/{contactId}/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": "<string>",
  "name": "<string>",
  "birthday": 123,
  "gender": "<string>",
  "picture": "<string>",
  "phone": "<string>",
  "email": "jsmith@example.com",
  "jobTitle": "<string>",
  "recipient": "<string>",
  "customFieldValues": [
    {
      "customFieldId": "<string>",
      "value": "<string>"
    }
  ]
}
'

{
  "id": "<string>",
  "name": "<string>",
  "birthday": 123,
  "gender": "<string>",
  "picture": "<string>",
  "phone": "<string>",
  "email": "jsmith@example.com",
  "jobTitle": "<string>",
  "recipient": "<string>",
  "customFieldValues": [
    {
      "customFieldId": "<string>",
      "value": "<string>"
    }
  ]
}