use MerchOne\PhpSdk\Http\Client;

class MyService
 {
    private Client $httpClient;
 
    public function __construct()
    {
        $this->httpClient = new Client();
    }
 
    public function doSomething(): void
     {
        // authenticate client using credentials
        $this->httpClient->auth(
            'your-store-user',
            'your-store-key'
        );
        
        // or authenticate client using base64 encoded credentials
        $this->httpClient->basicAuth(
            base64_encode('your-store-user:your-store-key'),
        );
        
        /* Interact with Catalog API */
        /** @var \MerchOne\PhpSdk\Contracts\Clients\CatalogApi $catalogApi */
        $catalogApi = $this->httpClient->catalog();
        
        /* Interact with Orders API */
        /** @var \MerchOne\PhpSdk\Contracts\Clients\OrdersApi $ordersApi */
        $ordersApi = $this->httpClient->orders();
        
        /* Interact with Shipping API */
        /** @var \MerchOne\PhpSdk\Contracts\Clients\ShippingApi $shippingApi */
        $shippingApi = $this->httpClient->shipping();
        
        // switch API version you interact with
        $this->httpClient->setVersion($version);
        
        // get current API version
        $this->httpClient->getVersion();
    }
}

use MerchOne\PhpSdk\Util\MerchOneApi;

// get the list of all available API versions
MerchOneApi::getVersions();