I need to integrate a new payment gateway to our corporate website, which is based on Social Engine. There is an extension for this `CMS` called Advanced Payment Gateways which allows integration of new gateways. In fact, it gets your gateway name and generates a skeleton structure zipped as a file so you can unzip and upload to your server and thus merge with the application directory. 

I&#39;m going to explain how I implement my gateway without Social Engine, and I hope someone can tell me how I can incorporate that into Social Engine.     

 1. First I connect to my `PSP` service: 

        $client = new nusoap_client(&#39;https://example.com/pgwchannel/services/pgw?wsdl&#39;);

 2. I prepare the following parameters in an array to send to `bpPayRequest`: 

    	$parameters = array(
    		&#39;terminalId&#39; =&gt; $terminalId,
    		&#39;userName&#39; =&gt; $userName,
    		&#39;userPassword&#39; =&gt; $userPassword,
    		&#39;orderId&#39; =&gt; $orderId,
    		&#39;amount&#39; =&gt; $amount,
    		&#39;localDate&#39; =&gt; $localDate,
    		&#39;localTime&#39; =&gt; $localTime,
    		&#39;additionalData&#39; =&gt; $additionalData,
    		&#39;callBackUrl&#39; =&gt; $callBackUrl,
    		&#39;payerId&#39; =&gt; $payerId);
    
    	// Call the SOAP method
    	$result = $client-&gt;call(&#39;bpPayRequest&#39;, $parameters, $namespace);

 3. If payment request is accepted, the result is a comma separated string, with the first element being **0**.   
Then we can send the second element (reference id) to payment
    gateway as follows via `POST` method:

    
        echo &quot;&lt;script language=&#39;javascript&#39; type=&#39;text/javascript&#39;&gt;postRefId(&#39;&quot; . $res[1] . &quot;&#39;);&lt;/script&gt;&quot;;
    
    	&lt;script language=&quot;javascript&quot; type=&quot;text/javascript&quot;&gt;    
    		function postRefId (refIdValue) {
    			var form = document.createElement(&quot;form&quot;);
    			form.setAttribute(&quot;method&quot;, &quot;POST&quot;);
    			form.setAttribute(&quot;action&quot;, &quot;https://example.com/pgwchannel/startpay&quot;);         
    			form.setAttribute(&quot;target&quot;, &quot;_self&quot;);
    			var hiddenField = document.createElement(&quot;input&quot;);              
    			hiddenField.setAttribute(&quot;name&quot;, &quot;RefId&quot;);
    			hiddenField.setAttribute(&quot;value&quot;, refIdValue);
    			form.appendChild(hiddenField);
    
    			document.body.appendChild(form);         
    			form.submit();
    			document.body.removeChild(form);
    		}
    		&lt;/script&gt;

 4. The gateway will return the following parameters via `POST` method to the call back `URL` that we provided in payment request:  
`RefId` (reference id as produced in previous steps)  
`ResCode` (Result of payment: 0 denotes success)  
`saleOrderId` (order id as passed during payment request)  
`SaleReferenceId` (sale reference code is given by PSP to the merchant)  

 5. If `ResCode` in the previous step was **0**, then we&#39;d need to pass the call `bpVerifyRequest` with the following parameters to verify payment, otherwise the payment will be canceled.    

         $parameters = array(
    		&#39;terminalId&#39; =&gt; $terminalId,
    		&#39;userName&#39; =&gt; $userName,
    		&#39;userPassword&#39; =&gt; $userPassword,
    		&#39;orderId&#39; =&gt; $orderId,
    		&#39;saleOrderId&#39; =&gt; $verifySaleOrderId,
    		&#39;saleReferenceId&#39; =&gt; $verifySaleReferenceId);
    
    	// Call the SOAP method
    	$result = $client-&gt;call(&#39;bpVerifyRequest&#39;, $parameters, $namespace);

 6. In case the result of `bpVerifyRequest` is zero, payment is certain and the merchant has to provide goods or services purchased. However, there is an optional method `bpSettleRequest`, which is used to request a settlement. It is called as follows:   
```
	$parameters = array(
		&#39;terminalId&#39; =&gt; $terminalId,
		&#39;userName&#39; =&gt; $userName,
		&#39;userPassword&#39; =&gt; $userPassword,
		&#39;orderId&#39; =&gt; $orderId,
		&#39;saleOrderId&#39; =&gt; $settleSaleOrderId,
		&#39;saleReferenceId&#39; =&gt; $settleSaleReferenceId);

	// Call the SOAP method
	$result = $client-&gt;call(&#39;bpSettleRequest&#39;, $parameters, $namespace);
```

I get confused by looking at default gateways in the Payment Gateways plugin e.g. PayPal, Stripe, 2Checkout, etc.  How am I incorporate this code logic into the newly created gateway skeleton? (the structure is shown below):  
[![enter image description here][1]][1]

You can check out the complete source code here:  
[default.php](https://gist.github.com/anonymous/02dcf681b3cd0852a18fb7723e34447f)    
[callback.php](https://gist.github.com/anonymous/19a5b759f767cef6cd40158b9a3f0577)



  [1]: https://i.stack.imgur.com/PZyCe.png


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How to add a custom payment gateway to Social Engine