// Sets config file path(if config file is used) and registers the classloader
    require("PPBootStrap.php");
    
    use PayPal\PayPalAPI\BMButtonSearchReq;
    use PayPal\PayPalAPI\BMButtonSearchRequestType;
    use PayPal\Service\ButtonManagerService;
    
    // Array containing credentials and confiuration parameters. (not required if config file is used)
    $config = array(
       'mode' => 'sandbox',
       'acct1.UserName' => 'jb-us-seller_api1.paypal.com',
       'acct1.Password' => 'WX4WTU3S8MY44S7F',
       "acct1.Signature" => "AFcWxV21C7fd0v3bYYYRCpSSRl31A7yDhhsPUU2XhtMoZXsWHFxu-RWy"
       .....
    );
    
    $buttonSearchReq = new BMButtonSearchReq();
    $buttonSearchReq->BMButtonSearchRequest = new BMButtonSearchRequestType();
    ......
    
    $buttonManagerService = new ButtonManagerService($config);
    $buttonSearchResponse = $buttonManagerService->BMButtonSearch($buttonSearchReq);
    
    if(strtoupper($buttonSearchResponse->Ack) == 'SUCCESS') {
        // Success
    }

    use PayPal\Auth\PPCertificateCredential;
    use PayPal\Auth\PPTokenAuthorization;
    
    $buttonManagerService = new ButtonManagerService($config);
    
    // Use the default account (the first account) configured in sdk_config.ini
    $response = $buttonManagerService->BMButtonSearch($buttonSearchReq);
    
    // Use a specific account configured in sdk_config.ini
    $response = $buttonManagerService->BMButtonSearch($buttonSearchReq, 'jb-us-seller_api1.paypal.com');	
    
    // Pass in a dynamically created API credential object
    $cred = new PPCertificateCredential("username", "password", "path-to-pem-file");
    $cred->setThirdPartyAuthorization(new PPTokenAuthorization("accessToken", "tokenSecret"));
    $response = $buttonManagerService->BMButtonSearch($buttonSearchReq, $cred);

    $config = array(
       'mode' => 'sandbox',
       'acct1.UserName' => 'jb-us-seller_api1.paypal.com',
       'acct1.Password' => 'WX4WTU3S8MY44S7F'
       .....
    );
    $service  = new ButtonManagerService($config); 

    define('PP_CONFIG_PATH', '/directory/that/contains/sdk_config.ini');
    $service  = new ButtonManagerService();

    /**
     * Some default options for curl
     * These are typically overridden by PPConnectionManager
     */
    public static $DEFAULT_CURL_OPTS = array(
        CURLOPT_SSLVERSION => 1,
        CURLOPT_CONNECTTIMEOUT => 10,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_TIMEOUT        => 60,   // maximum number of seconds to allow cURL functions to execute
        CURLOPT_USERAGENT      => 'PayPal-PHP-SDK',
        CURLOPT_HTTPHEADER     => array(),
        CURLOPT_SSL_VERIFYHOST => 2,
        CURLOPT_SSL_VERIFYPEER => 1,
        CURLOPT_SSL_CIPHER_LIST => 'TLSv1',
    );