Add PayPal transactionId parameter. Closes #43 #44

Author: amacneil

src/Omnipay/PayPal/Message/ExpressAuthorizeRequest.php

@@ -25,6 +25,7 @@ public function getData()
         $data['PAYMENTREQUEST_0_PAYMENTACTION'] = 'Authorization';
         $data['PAYMENTREQUEST_0_AMT'] = $this->getAmountDecimal();
         $data['PAYMENTREQUEST_0_CURRENCYCODE'] = $this->getCurrency();
+        $data['PAYMENTREQUEST_0_INVNUM'] = $this->getTransactionId();
         $data['PAYMENTREQUEST_0_DESC'] = $this->getDescription();
 
         // pp express specific fields

src/Omnipay/PayPal/Message/ExpressCompleteAuthorizeRequest.php

@@ -27,6 +27,7 @@ public function getData()
         $data['PAYMENTREQUEST_0_PAYMENTACTION'] = $this->action;
         $data['PAYMENTREQUEST_0_AMT'] = $this->getAmountDecimal();
         $data['PAYMENTREQUEST_0_CURRENCYCODE'] = $this->getCurrency();
+        $data['PAYMENTREQUEST_0_INVNUM'] = $this->getTransactionId();
         $data['PAYMENTREQUEST_0_DESC'] = $this->getDescription();
 
         $data['TOKEN'] = $this->httpRequest->query->get('token');

src/Omnipay/PayPal/Message/ProAuthorizeRequest.php

@@ -25,11 +25,11 @@ public function getData()
         $this->validate('amount', 'card');
         $this->getCard()->validate();
 
-        $prefix = '';
-        $data[$prefix.'PAYMENTACTION'] = $this->action;
-        $data[$prefix.'AMT'] = $this->getAmountDecimal();
-        $data[$prefix.'CURRENCYCODE'] = $this->getCurrency();
-        $data[$prefix.'DESC'] = $this->getDescription();
+        $data['PAYMENTACTION'] = $this->action;
+        $data['AMT'] = $this->getAmountDecimal();
+        $data['CURRENCYCODE'] = $this->getCurrency();
+        $data['INVNUM'] = $this->getTransactionId();
+        $data['DESC'] = $this->getDescription();
 
         // add credit card details
         $data['ACCT'] = $this->getCard()->getNumber();