signUpUserWithProps method
Implementation
Future<Session> signUpUserWithProps(Map<String, dynamic> properties) async {
var body = <String, dynamic>{
"grant_type": "password",
"client_id": this.config.clientId,
};
if (properties != null) body.addAll(properties);
return apiPost("/access/signup", body)
.then((res) => processAccessToken(res)
.then((session) => apiMe().then((u) => session)) );
}