Fixed return values.

Fixed last of the return values.

src/Message/CompleteRequest.php

@@ -6,11 +6,16 @@ class CompleteRequest extends AbstractRequest
 {
     public function getData()
     {
-        return $this->httpRequest->request->all();
+        return $this->httpRequest->request->all() ?? $this->httpRequest->query->all();
     }
 
     public function sendData($data)
     {
         return $this->response = new CompleteResponse($this, $data);
     }
+
+    public function setMerchantId($value)
+    {
+        $this->setParameter('merchantId', $value);
+    }
 }

tests/TestCase.php

@@ -73,4 +73,18 @@ public function testCompletePurchase()
         $this->assertSame('payment_Instrument', $response->getTransactionId());
         $this->assertSame(500, $response->getTransactionReference());
     }
+
+    public function testCompleteResponse()
+    {
+        $this->getHttpRequest()->request->replace([
+            'paymentInstrumentId' => '',
+            'transactionId'       => 1,
+        ]);
+        $request = $this->gateway->completePurchase();
+        $this->assertInstanceOf(CompleteRequest::class, $request);
+
+        $response = $request->send();
+        $this->assertTrue($response->isSuccessful());
+        $this->assertSame('250525', $response->getTransactionReference());
+    }
 }