toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (accessToken != null) 'access_token': accessToken!,
if (expiresIn != null) 'expires_in': expiresIn!,
if (issuedTokenType != null) 'issued_token_type': issuedTokenType!,
if (tokenType != null) 'token_type': tokenType!,
};