WIP: Receipt parameter (not required). Add OutSumCurrency parameter, rename currency label parameter

src/Message/AbstractRequest.php

@@ -84,6 +84,52 @@ public function setClient($value)
         return $this->setParameter('client', $value);
     }
 
+    /**
+     * @return string
+     */
+    public function getReceipt()
+    {
+        return rawurlencode($this->getParameter('receipt'));
+    }
+
+    /**
+     * @param $value
+     * @return \Omnipay\Common\Message\AbstractRequest
+     */
+    public function setReceipt($value)
+    {
+        return $this->setParameter('receipt', $value);
+    }
+
+    public function getCurrency()
+    {
+        $currency = $this->getParameter('currency');
+        if ($currency === 'RUB') {
+            return '';
+        }
+
+        return $currency;
+    }
+
+    /**
+     * Get the payment currency label.
+     *
+     * @return string
+     */
+    public function getCurrencyLabel()
+    {
+        return $this->getParameter('currencyLabel');
+    }
+
+    /**
+     * @param string $value
+     * @return AbstractRequest
+     */
+    public function setCurrencyLabel($value)
+    {
+        return $this->setParameter('currencyLabel', $value);
+    }
+
     /**
      * Get the secret key.
      *

src/Message/PurchaseRequest.php

@@ -23,9 +23,11 @@ public function getData()
             'MrchLogin' => $this->getPurse(),
             'OutSum' => $this->getAmount(),
             'Desc' => $this->getDescription(),
-            'IncCurrLabel' => $this->getCurrency(),
+            'IncCurrLabel' => $this->getCurrencyLabel(),
+            'OutSumCurrency' => $this->getCurrency(),
             'SignatureValue' => $this->generateSignature(),
-            'IsTest' => (int)$this->getTestMode(),
+            'IsTest' => (int) $this->getTestMode(),
+            'Receipt' => $this->getReceipt(),
         ] + $this->getCustomFields();
     }
 
@@ -34,9 +36,15 @@ public function generateSignature()
         $params = [
             $this->getPurse(),
             $this->getAmount(),
-            $this->getInvId(),
-            $this->getSecretKey()
+            $this->getInvId()
         ];
+        if ($this->getCurrency()) {
+            $params[] = $this->getCurrency();
+        }
+        if ($this->getReceipt()) {
+            $params[] = $this->getReceipt();
+        }
+        $params[] = $this->getSecretKey();
 
         foreach ($this->getCustomFields() as $field => $value) {
             $params[] = "$field=$value";