curl --request PATCH \
  --url https://astrasend-mocha.vercel.app/api/public/contacts/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "first_name": "<string>",
  "last_name": "<string>",
  "source": "<string>",
  "custom_fields": {}
}
'

{
  "ok": true
}