How can I add a discount code entry section to my pay screen?

[freemytimenow]

I am having a promotion and would like to add a discount box on the payment sceen. 

[skier]

Unfortunately at the present time with Website Payments Standard you cannot do what you have in mind.

With PayPal's Website Payments Standard, you're limited to changing the color scheme, displaying a business graphic logo (providing you have a Business Account), changing the text on the Note to Seller option box ("cn" variable) and changing the text on the "Return to Merchant" link ("cbt" variable).   That's it.

As for other options to use coupons or discounts.  If you're into coding your own stuff, see this link for tips and examples.   Else, you will need to use a 3rd party shopping cart that has the features you need.

Regards,

skier