I am starting a business and I would like to offer Paypal as a payment option, but for my business it is essential to be able to block an amount of money, just like a car rental or a hotel does on a credit card. Would it be possible to block an amount from my users PayPal account and release it or book it for good later?
My business is of course an online service, and I want to do this pragmatically in a Spring based application.
I think what you are looking for is Authorization and capture.
I haven't used that feature from Paypal, but have used it elsewhere. What you are looking for is usually called card authorization, preauthorization, or preauth.