toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (exchangeError != null) 'exchangeError': exchangeError!,
if (expirationTime != null) 'expirationTime': expirationTime!,
if (scopes != null) 'scopes': scopes!,
if (token != null) 'token': token!,
};