i basically have a desktop application that i distribute to my customers to use (so it can be installed on any desktop). and every month i invoice them for services they use within the system. so i need a way to process the payments which they need to make to me. the invoice amount will be set by me and may vary from customer to customer. so i would like a button in my application to open up the paypal web page on which my customers can enter their card details and complete the payment to me. is this possible? alternatively, i could use the direct integration api where the user enters their card details in my application and i send that along with the payment information to the paypal gateway to process the payment. however, i was hoping the former was possible to save me paying the monthly fee. i hope this is clear.
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