curl --request POST \
  --url http://localhost:3000/api/contact/upsert \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": [
    {
      "primaryPhone": "+212612345678",
      "firstName": "John",
      "lastName": "Doe",
      "fullName": "John Doe",
      "primaryEmail": "john@example.com",
      "address": "123 Main St",
      "city": "Casablanca",
      "state": "Casablanca-Settat",
      "zip": "20000",
      "occupation": "Engineer",
      "preferredChannel": "phone",
      "customAttributes": {
        "age": 30,
        "interests": [
          "tech"
        ]
      }
    }
  ]
}
'