Amazon Payments Drop Down

Below is an example of an Amazon Simple Pay button. I've replaced the hidden input description field with a select. This gives you a multiple choice drop-down that you can use for things like selecting a shirt size. Here's the full finished code.

<div align="center">
<form action="https://authorize.payments.amazon.com/pba/paypipeline" method="post">
  <input type="hidden" name="amount" value="USD 22.45" >
  <input type="hidden" name="processImmediate" value="1" >
  <input type="hidden" name="signatureMethod" value="HmacSHA256" >
  <input type="hidden" name="accessKey" value="[key]" >
  <input type="hidden" name="collectShippingAddress" value="1" >
  <select name="description" style="margin-bottom: 10px;">
    <option value="Awk Tee">Select Size</option>
    <option value="Small Awk Tee">Small</option>
    <option value="Medium Awk Tee">Medium</option>
    <option value="Large Awk Tee">Large</option>
    <option value="X-Large Awk Tee">X-Large</option>
    <option value="XX-Large Awk Tee">XX-Large</option>
  </select>
  <br>
  <input type="hidden" name="amazonPaymentsAccountId" value="[id]" >
  <input type="hidden" name="cobrandingStyle" value="logo" >
  <input type="hidden" name="signatureVersion" value="2" >
  <input type="hidden" name="immediateReturn" value="1" >
  <input type="hidden" name="signature" value="[signature]" >
  <input type="image" src="http://g-ecx.images-amazon.com/images/G/01/asp/golden_large_paynow_withmsg_whitebg.gif" border="0">
</form>
</div>

The original line looked, which I replaced, was the following.

<input type="hidden" name="description" value="T-Shirt" >

That line is replaced with this select.

  <select name="description" style="margin-bottom: 10px;">
    <option value="Awk Tee">Select Size</option>
    <option value="Small Awk Tee">Small</option>
    <option value="Medium Awk Tee">Medium</option>
    <option value="Large Awk Tee">Large</option>
    <option value="X-Large Awk Tee">X-Large</option>
    <option value="XX-Large Awk Tee">XX-Large</option>
  </select>

You'll want to generate the full button using the Amazon Payments system and then make that minor modification to get your description.