> ## Documentation Index
> Fetch the complete documentation index at: https://grandcentral.backbase.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Reference

> Error code mappings between Feedzai and Grand Central for troubleshooting

The Feedzai integration scores user activity for fraud and financial-crime risk, retrieving activity analysis and decisions for known and prospect users and sending feedback on those decisions. For setup steps, see [Get started](/connectors/fraud-detection/feedzai/get-started).

## Supported operations

The Feedzai Connector supports the following operations.

### Retrieve user activity analysis

* Retrieve user activity analysis details and decision.

### Retrieve new user activity analysis

* Retrieve unknown (prospect) user activity analysis and decision.

### Provide feedback on user activity analysis

* Provide feedback on the (unknown) user activity decision retrieved in case of false positive or false negative.

### Stream session risk events

* Subscribe to a real-time feed of normalized session risk events from Feedzai Digital Trust for Account Monitoring.

## Events

This connector is synchronous and doesn't publish or consume events.

## Error mapping

The following table maps each Feedzai error code to its Grand Central counterpart:

| Feedzai code | Grand Central code |
| :----------- | :----------------- |
| `401`        | `GC002`            |
| `403`        | `GC004`            |
| `500`        | `GC028`            |
| `404`        | `GC054`            |
| `400`        | `GC055`            |

<Info>
  For a complete list of Grand Central error codes and their descriptions, see [Status codes, errors, and responses](/connectors/reference/error-codes).
</Info>