We have S2 member and will upgrade to pro. I am using PayPal Standard now and don't want to go with PPal Pro. Can I use Promo codes from S2 Pro in Paypal Standard? Thanks
You can use the coupons with the pro-forms only. The pro-forms can be used without PayPal Pro, but then the user will be required to have a PayPal account to make the payment. Some users have reported that they managed to have PayPal not require they have an account, but I can't confirm it.
If you use the pro-form with Express Checkout and would rather not require the user to have a PayPal account to pay, you could try changing the setting PayPal Admin -> Profile -> My Selling Tools -> Website Preferences -> PayPal Account Optional. Let me know if that does the trick.