Help with WebClient for Credit Card Transactions

[johanl]

Hello

I need to allow my NTWS web server app to connect and process credit card transactions. The provider is Paygate and requires the following post.

<form action=" https://www.paygate.co.za/paywebv2/process.trans" method="POST" >
<input type="hidden" name="PAYGATE_ID" value="10011013800">
<input type="hidden" name="REFERENCE" value="Customer1">
<input type="hidden" name="AMOUNT" value="3299">
<input type="hidden" name="CURRENCY" value="ZAR">
<input type="hidden" name="RETURN_URL" value="http://www.mywebsite.com/thanks.php">
<input type="hidden" name="TRANSACTION_DATE" value="2012-01-30 18:30:00">
<input type="hidden" name="EMAIL" value=”customer@mywebsite.com">
<input type="hidden" name="CHECKSUM" value="928ad0f73064d137c4af14457954f8a1">
</form>
 
My questions are as follows:

1. In webclient do I just use set value to encode the values to the post URL?
2. There is a MD5 Algorithm that I have asp and PHP code for that generates the checksum - how do I handle that?

Any help will be appreciated

Johan