i want to create a custom but now (or another pay now paymnet... ) so i read the documetation at paypal.com (Paypal API). and i read about HTML variables. so far i understand that for create a buy now with dynamic price i need to set the amount variable to my price. seconds i have the item_name and item_id variables for information about the productd.
but my que's are, where do i set the acount that my client pay for? i mean where i set to where the money will transfer?
seconds, is there anyway to add an another data that will send back to my server after the payment complete?