toJson method
Implementation
@override
Map<String, Object?> toJson() => {
if (id != null) "id": encodeValue(id),
if (tokenType != null) "token_type": encodeValue(tokenType),
if (issuedAt != null) "issued_at": encodeValue(issuedAt),
if (token != null) "token": encodeValue(token),
};