Hi, I've got a question about the integration of PayPal to a specific kind of service. Currently we've got a couple of customers running online shops that we develop and host for them and now we want to abstract away all those different payment providers to our customers (the shop holders) by making all the payments for the purchases of products on the shops we host to go through our billing service. Therefore when a consumer purchases a product in one of our online shops we want them to comfortably pay using PayPal and we also want to first charge a fee for our services (usually 2%, depends on the type of customer though), then directly transfer the remaining 98% to the shop holders bank account. The question is how to integrate PayPal with our service in such a way? There's also the question of what kind of legal issues might arise (we're located in the EU, Germany).
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