{
  "fields": [
    {"name": "first_name", "dtype": "string", "required": true, "aliases": ["FirstName", "FName", "First Name"]},
    {"name": "last_name",  "dtype": "string", "required": true, "aliases": ["LastName", "Surname", "Last Name"]},
    {"name": "email",      "dtype": "string", "required": true, "aliases": ["Email", "E-mail", "email_addr", "EmailAddr"]},
    {"name": "phone",      "dtype": "string", "aliases": ["Phone Number", "Tel", "phone_number"]},
    {"name": "country",    "dtype": "string", "aliases": ["Country", "country_code", "Region"]}
  ]
}