Cannot be done. Paypal is a very basic payment gateway. You will have to create one account for each web site. Each account should have its own email, and bank account. I have tried one account with different websites, does not work. An easy way for paypal is to let merchant accounts have multiple customer contact emails and different payment receipts for each site. But that involves 5 years of engineering for a few clients. So they will not do it. Neither will any of the other payment gateways.
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