Payment Gateway » NMI - Three Step Redirect

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h1. Programming Guide

This guide describes how to make use of the NMI APIs for payment related transaction and it consists of 2 main parts:

* [[programming guide#Step-By-Step|Step-By-Step]] - describes the 

* API Reference - the detailed description of all the APIs mentioned in [[programming guide#Step-By-Step|Step-By-Step]]

The demo application can be found here:

> http://192.168.2.68/ukstore/nmi-sample/orders.jsp

h2. Step-By-Step

Before begin, install the following libraries into your development environment *_(remove the old versions if exists)_*:

* "HttpCore 4.1.2":http://192.168.2.13:8081/nexus/service/local/artifact/maven/redirect?r=central&g=org.apache.httpcomponents&a=httpcore&v=4.1.2&e=jar

* "HttpClient 4.1.2":http://192.168.2.13:8081/nexus/service/local/artifact/maven/redirect?r=central&g=org.apache.httpcomponents&a=httpclient&v=4.1.2&e=jar

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*Steps:*

# gather the 

h2. Generate the form action URL

Generates the <code>form</code> action URL which is needed in the self-hosted payment form.

_Method Signature:_

<pre>

<code class="JAVA">

public static String getFormActionUrl(String orderId, String orderDescription, BigDecimal orderAmount, String returnUrl)

</code>

</pre>

h3. Input Parameters

* _orderId_ - the unique ID for the order

* _orderDescription_ - a simple description of the order

* _orderAmount_ - the settlement amount of the order in 2 decimal places, e.g. 12.34

* _returnUrl_ - the receipt URL

h3. Output Parameters

Returns a <code>form</code> action URL

h3. Code Snippets

<pre>

<code class="JAVA">

	String orderId = request.getParameter("order-id");

	String orderDescription = request.getParameter("order-description");

	BigDecimal orderAmount = new BigDecimal(request.getParameter("order-amount"));

	String returnUrl = request.getParameter("return-url");

	String formUrl = PaymentUtils.getFormActionUrl(orderId, 

			orderDescription, 

			orderAmount, 

			returnUrl);

</code>

</pre>