> ## 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 the Smarty Connector and Grand Central for troubleshooting

The Smarty integration validates and autocompletes postal addresses for US and international customers during onboarding and payment flows. For setup steps, see [Get started](/connectors/kyc-kyb/smarty/get-started).

## Supported operations

The Smarty connector supports the following operations.

### Address autocomplete

* Retrieve an address list based on the end-user's initial input.
  * The Smarty Connector triggers the US address autocomplete endpoint when `country` = "US".
  * The Smarty Connector triggers the international address autocomplete endpoint when `country` != "US".

### Address validation

* Retrieve complementary address information, such as type of address (commercial, residential) or whether the address is suitable for mailing.

## Events

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

## Error mapping

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

| Smarty Connector code                  | Grand Central code |
| :------------------------------------- | :----------------- |
| `Unauthorized/authentication required` | `GC002`            |
| `Method not allowed`                   | `GC023`            |
| `Bad request`                          | `GC025`            |
| `international-autocomplete-api`       | `GC025`            |
| `us-autocomplete-api`                  | `GC025`            |
| `us-street-api`                        | `GC025`            |
| `Internal server error`                | `GC025`            |
| `Payment required error`               | `GC025`            |
| `Rate limit imposed`                   | `GC031`            |
| `Not found`                            | `GC054`            |

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