We use PayPal Invoicing to bill our clients. We've just been notified from one client that they are changing their payment procedure. They sent us a partial MasterCard number that will remain constant, and for every invoice of ours that they pay, they will send the remainder of the MasterCard number. This remainder will be dynamically generated for every payment that they make, making the transaction more secure. Of course, this will require us to have a method of actually making the payment in PayPal ourselves. Is this possible? Can we click on the 'Pay Now' link in the email that was sent to the client when the invoice was generated, and pay the invoice ourselves using the complete MasterCard number that they sent?
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