public function getArgs() {
    // ritorna gli argomenti opportunamente strutturati per una chiamata WSDL
    return array(
      'msisdn' => $this->args['telephone'],
      'fieldMap' => array(
        'VAS_PP_USER.CUSTOMERS.BIRTHDATE' => array(
          $this->args['birthdate'], 'Date', '='
        )
      ),
      'merchantId' => $this->args['merchantId'],
      'productCode' => $this->args['productCode'],
      'amount' => $this->args['amount'],
      'currency' => 'EUR',
      'channel' => 'WEB', // WEB o WAP, non ha senso renderlo configurabile.
      'transactionId' => $this->args['transactionId'],
      'action' => 'SUBMIT',
      'productName' => $this->args['productName'],
      'productCategory' => 1, // non variabile
    );
  }