createJson method
Implementation
@override
Map<String, dynamic> createJson() => {
...super.createJson(),
"username": username,
if (password.isNotEmpty) ...{
"password": password,
},
if (email != null) ...{
"email": email,
},
if (mobilePhoneNumber != null) ...{
"mobilePhoneNumber": mobilePhoneNumber,
},
};