# Error Code Glossary

This glossary provides a reference for common error messages returned by the API, along with their descriptions and suggested actions.

## 🧾 Error Reference Table

| HTTP Code | Error Message | Description | Suggested Action |
|  --- | --- | --- | --- |
| 400 | `Missing field 'accountId'` | Required field is missing | Verify request parameters |
| 401 | `Invalid credentials` | Authentication failed | Re-authenticate using valid credentials |
| 403 | `IP address not allowed` | Request made from non-whitelisted IP | Check and update IP restrictions |
| 403 | `Forbidden` | Client is authenticated but does not have permission for this resource | Verify user or token permissions |
| 404 | `Account not found` | Resource could not be located | Ensure account ID or endpoint is correct |
| 409 | `Duplicate transfer request` | Conflict with current state | Use idempotency or retry with care |
| 429 | `Rate limit exceeded` | Too many requests in the time window | Wait and retry after `retry_after` time |
| 500 | `An unknown error occurred` | Internal server error | Try again or contact support |