Fixes for Omnipay 3.0

Update PurchaseRequest.php
Update PurchaseResponse.php
Update CompletePurchaseResponse.php

src/Message/AbstractRequest.php

@@ -17,6 +17,28 @@ abstract class AbstractRequest extends \Omnipay\Common\Message\AbstractRequest
 {
     protected $zeroAmountAllowed = false;
 
+    /**
+     * Get the purse.
+     *
+     * @return integer invid
+     */
+    public function getInvId()
+    {
+        return $this->getParameter('invid');
+    }
+
+    /**
+     * Set the purse.
+     *
+     * @param integer $invid invid
+     *
+     * @return self
+     */
+    public function setInvId($value)
+    {
+        return $this->setParameter('invid', $value);
+    }
+
     /**
      * Get the purse.
      *

src/Message/CompletePurchaseResponse.php

@@ -50,9 +50,8 @@ public function generateSignature()
     public function getCustomFields()
     {
         $fields = array_filter([
-            'Shp_TransactionId' => $this->getTransactionId(),
-            'Shp_Client' => $this->getClient(),
             'Shp_Currency' => $this->getCurrency(),
+            'Shp_TransactionId' => $this->getTransactionId(),
         ]);
 
         ksort($fields);

src/Message/PurchaseRequest.php

@@ -19,7 +19,7 @@ public function getData()
         );
 
         return [
-            'InvId' => '0',
+            'InvId' => $this->getInvId(),
             'MrchLogin' => $this->getPurse(),
             'OutSum' => $this->getAmount(),
             'Desc' => $this->getDescription(),
@@ -32,9 +32,9 @@ public function getData()
     public function generateSignature()
     {
         $params = [
-            $this->getAmount(),
             $this->getPurse(),
-            '0',
+            $this->getAmount(),
+            $this->getInvId(),
             $this->getSecretKey()
         ];