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2012-02-21T14:11:33.013
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2012-04-09T12:29:55.153
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<p>I made a simple app to demonstrate how off-site payments for Worldpay and Rails/Activemerchant can work together. </p> <p><strong>Demo Rails App</strong>- <a href="https://github.com/daemonsy/Worldpay-Rails--Off-Site--Integration-Example" rel="noreferrer">https://github.com/daemonsy/Worldpay-Rails--Off-Site--Integration-Example</a></p> <p>For World Pay hosted payment, basically a <code>post</code> to their payment URL is required. Add <code>test-</code> to secure.worldpay.com for testing mode. WP requires amount, currency, installation ID and cartId to render the page to the customer.</p> <pre><code><form action="https://test-secure.worldpay.com/wcc/purchase" method=POST>  <input type="hidden" name="testMode" value="100">  <input type="hidden" name="instId" value="Your installation ID ">  <input type="hidden" name="cartId" value="Your ID for the product ">  <input type="hidden" name="amount" value="The cost of the product ">  <input type="hidden" name="currency" value="currency code e.g. GBP, USD ">  <input type=submit value=" Buy This "> </code></pre> <p> Source: <a href="http://www.worldpay.com/support/kb/bg/htmlredirect/rhtml.html" rel="noreferrer">http://www.worldpay.com/support/kb/bg/htmlredirect/rhtml.html</a></p> <p>This creates a simple <code>button</code> that carries your order to World Pay where the customer will enter credit card details and complete the purchase. I've embedded the above code in the <code>show</code> page of an orders controller. e,g, <code><input type="hidden" name="amount" value="<%=@order.amount"%>></code>. So you can click <code>buy this</code> after submitting the order. There are many ways to achieve a <code>POST</code> to World Pay.</p> <p>After which, World Pay can show a shopper response page, send you <code>payment response</code> etc. For payment response to work, you can setup the payment response <code>callback URL</code> to one of your controllers. e.g. =><a href="http://mysite.com/payment-backend" rel="noreferrer">http://mysite.com/payment-backend</a></p> <p>This will be a <code>POST</code> request so you have to setup your controller to handle it. This is where <code>Activemerchant</code> kicks in. For example, </p> <pre><code>class BackendsController < ApplicationController include ActiveMerchant::Billing::Integrations protect_from_forgery :except=>[:worldpay_return] #in routes => match '/payment-backend'=>'backends#worldpay_return' def worldpay_return notification = WorldPay::Notification.new(request.raw_post) order = Order.find(notification.item_id) if notification.acknowledge begin if notification.complete? order.status = 'success' end rescue order.status = "failed" raise ensure order.save end end render :text =>"Order status for #{order.id} is #{order.status}" end end </code></pre> <p>So the Notification object will read the params in <code>request.raw_post</code> and set them up the an object where you can query. I found the active merchant docs useful in telling what return params are mapped by it. </p> <p>Note that this controller is a very crude example. World Pay provides a few methods for you to validate the response and this is supported by Active Merchant. </p> <p><strong>ActiveMerchant Docs on WorldPay::Notifications</strong> <a href="http://rdoc.info/github/Shopify/active_merchant/master/ActiveMerchant/Billing/Integrations/WorldPay" rel="noreferrer">http://rdoc.info/github/Shopify/active_merchant/master/ActiveMerchant/Billing/Integrations/WorldPay</a> <strong>World Pay Payment Response Docs</strong> <a href="http://www.worldpay.com/support/kb/bg/paymentresponse/payment_response.html" rel="noreferrer">http://www.worldpay.com/support/kb/bg/paymentresponse/payment_response.html</a></p>
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