gistfile1.erb

<form action="https://authorize.payments-sandbox.amazon.com/pba/paypipeline" method="POST">
<input type="image" src="https://authorize.payments-sandbox.amazon.com/pba/images/payNowButton.png" border="0">
<input type="hidden" name="accessKey" value="AKIAIWDZU3QUHNQF2TAQ" >
<input type="hidden" name="amount" value="USD 1.1" >
<input type="hidden" name="description" value="Test Widget" >
<input type="hidden" name="signatureMethod" value="HmacSHA256" >
<input type="hidden" name="referenceId" value="test-reference123" >
<input type="hidden" name="immediateReturn" value="0" >
<input type="hidden" name="returnUrl" value="http://yourwebsite.com/return.html" >
<input type="hidden" name="abandonUrl" value="http://yourwebsite.com/cancel.html" >
<input type="hidden" name="processImmediate" value="1" >
<input type="hidden" name="ipnUrl" value="http://yourwebsite.com/ipn" >
<input type="hidden" name="cobrandingStyle" value="logo" >
<input type="hidden" name="signatureVersion" value="2" >
<input type="hidden" name="signature" value="TcFtsTaJIF0gzLeQjk/PQH+sUbi+0+Z/J9mh4m5CYVU=" >
</form>