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 La variable login prend la valeur du merchantID 
 La variable password prend la valeur de l'accessKey

 //Construction de la requête verifyEnrolment avec les objets payment, card et orderRef
 $verifyEnrollmentRequest = array (
   'payment' => $this->payment($array['payment']),
   'card' => $this->card($array['card']),
   'orderRef' => $array['orderRef']
 );

 //Construction de l'entete du message public $header_soap;
 $this->header_soap = array();
 $this->header_soap['proxy_host'] = $this->proxy_host = PROXY_HOST;
 $this->header_soap['proxy_port'] = $this->proxy_port = PROXY_PORT;
 $this->header_soap['proxy_login'] = $this->proxy_login = PROXY_LOGIN;
 $this->header_soap['proxy_password'] = $this->proxy_password = PROXY_PASSWORD;
 $this->header_soap['login'] = $this->login = MERCHANT_ID;
 $this->header_soap['password'] = $this->password = ACCESS_KEY;
 $this->header_soap['style'] = SOAP_DOCUMENT;
 $this->header_soap['use'] = SOAP_LITERAL; 

 // Creation de l'instance SoapClient qui va permettre l'appel du WebService
 // Déclaration du endPoint ainsi que du header

 $client = new SoapClient('https://services.payline.com/V4/services/DirectPaymentAPI', $this->header_soap); 

 //Appel du WebService
 $verifyEnrollmentResponse = $client->verifyEnrollment($verifyEnrollmentRequest);