Test payment transaction

<form action="https://secure-test.worldpay.com/wcc/purchase" method=POST> <!-- Specifies the URL for our test environment -->
<input type="hidden" name="testMode" value="100"> <!-- 100 instructs our test system -->
<input type="hidden" name="instId" value="The installation ID "> <!-- A mandatory parameter -->
<input type="hidden" name="cartId" value="The ID for the product "> <!-- A mandatory parameter - reference for the item purchased -->
<input type="hidden" name="amount" value="The cost of the product "> <!-- A mandatory parameter -->
<input type="hidden" name="currency" value="currency code e.g. GBP, USD "> <!-- A mandatory parameter. ISO currency code -->
<input type=submit value=" Buy This "> <!-- Creates the button. When clicked, the form submits the purchase details to us. -->