have you example ?

[salegoodluck]

/**
* Get authenticated FBA Inbound API Instance using
* credential from the configuration
*
* @return FbaInboundApi
*/
public function getFbaInboundApiInstance(): FbaInboundApi
{
$tokenStorage = new FsTokenStorage($this->config->get('application')->get('cacheDir') . DS . '.aws-tokens');
$stsAuthenticationConfiguration = new Configuration();
$stsConfig = $this->config->get('aws')->get('sts');
$lwaConfig = $this->config->get('amazon')->get('lwa');
$spApiConfig = $this->config->get('amazon')->get('selling_partner_api');

    $stsAuthenticationConfiguration->setApiKey('refresh_token', $lwaConfig['refresh_token']);
    $stsAuthenticationConfiguration->setApiKey('client_id', $lwaConfig['client_id']);
    $stsAuthenticationConfiguration->setApiKey('client_secret', $lwaConfig['client_secret']);
    $stsAuthenticationConfiguration->setApiKey('access_key', $stsConfig['access_key']);
    $stsAuthenticationConfiguration->setApiKey('secret_key', $stsConfig['secret_key']);
    $stsAuthenticationConfiguration->setApiKey('role_arn', $stsConfig['role_arn']);
    $stsAuthenticationConfiguration->setDebug(false);

    $credential = new Credentials($tokenStorage, $stsAuthenticationConfiguration);
    // Cache and retrieve both LWA tokens and assumeRole via sts tokens
    $tokens = $credential->getCredentials();

    $config = Configuration::getDefaultConfiguration();
    $config->setAccessToken($tokens['lwa_access_token']);
    $config->setApiKey('accessKey', $tokens['sts_credentials']['access_key']);
    $config->setApiKey('secretKey', $tokens['sts_credentials']['secret_key']);
    $config->setApiKey('region', $spApiConfig['region']);
    $config->setApiKey('securityToken', $tokens['sts_credentials']['session_token']);
    $config->setDebug(false);
    $config->setHost($spApiConfig['host']);

    return new FbaInboundApi(
        new Client(),
        $config
    );
}

how can use this function getFbaInboundApiInstance ? are you wirte example ?