| Unauthorised/Unauthenticated | Username & password in not correct(in Auth API) | 401 | missing_parameters_in_headers |
| Unauthorised/Unauthenticated | Public token is invalid | 401 | invalid_parameters_in_headers |
| Unauthorised/Unauthenticated | Public token is missing | 401 | missing_parameters_in_headers |
| Unauthorised/Unauthenticated | Public token is expire | 401 | expired_parameters_in_headers |
| Unauthorised/Unauthenticated | User access token is invalid | 401 | invalid_parameters_in_headers |
| Unauthorised/Unauthenticated | User access token is missing | 401 | missing_parameters_in_headers |
| Unauthorised/Unauthenticated | User access token is expire | 401 | expired_parameters_in_headers |
| Unauthorised/Unauthenticated | Unauthorised access to transaction | 401 | unauthorized_access |
| Forbidden | User access token is not mapped with Public access token(Client) | 403 | client_not_authorized |
| Bad Request(Parameters is missing or Invalid) | Parameter is missing in request(Either one or more parameters) | 400 | missing_parameters_in_request |
| Bad Request(Parameters is missing or Invalid) | Parameters are not incorrect(If value is not correct) | 400 | wrong_parameters_in_request |
| Bad Request(Parameters is missing or Invalid) | Parameters are not incorrect (If value is not valid) | 400 | invalid_parameters_in_request |
| Bad Request(Parameters is missing or Invalid) | Parameters are not in correct format | 400 | incorrect_format_of_parameters_in_request |
| Bad Request(Parameters is missing or Invalid) | Parameter are not in correct type(Wrong type of parameters) in request | 400 | incorrect_type_of_parameters_in_request |
| Bad Request(Parameters is missing or Invalid) | Callback is not available | 400 | missing_callback_url |
| Bad Request(Parameters is missing or Invalid) | Parameters is expired | 400 | expired_parameters_in_request |
| Unprocessable request | Dormant user | 422 | inactive_user |
| Unprocessable request | Concurrent user/ Session is available is other device | 400 | session_available_in_other_device |
| Resource not available | Not authorised to complete the request | 404 | feature_not_available |
| Source is not authorised | Request is not from whitelisted IP | 401 | ip_not_whitelisted |
| Rate limit exceeded | More number of request than rate limit | 401 | rate_limit_exceeded |
| Method not allowed | Wrong method | 405 | method_not_allowed |
