I have a merchant account that i like to integrate with Ebay.
Once the winner wins the aution , he can click the pay now button and he will be given 2 choice, either to pay via PAYPAL or the merchant account.
I would like the ability to offer discount if the winner chooses to pay via merchant account instead of paypal.
You need not to write the script from scratch, you can use other EBAY solution providers that allows integration of merchant account with the checkout/ payment process.
Bidders should have previous experience, i am wary of giving beginners a chance due to less than pleasant past experience.