# Errors 
Error codes for HTTP code 400:
<table>
<thead>
<tr>
<th>Code</th>
<th>Message</th>
</tr>
</thead>
<tbody>
<tr>
<td>INVALID_USER</td>
<td>Invalid user</td>
</tr>
<tr>
<td>INVALID_PARAMETER</td>
<td>Invalid parameter</td>
</tr>
<tr>
<td>INVALID_SIGNATURE</td>
<td>Invalid signature</td>
</tr>
<tr>
<td>INCORRECT_AMOUNT</td>
<td>Incorrect amount</td>
</tr>
<tr>
<td>INCORRECT_INVOICE</td>
<td>Incorrect invoice</td>
</tr>
</tbody>
</table>

```
HTTP/1.1 400 Bad Request
{
    "error":{
        "code":"INVALID_USER",
        "message":"Invalid user"
    }
}
```