Why are you jumping through all those hoops?  Set your credit card as your backup payment option with Paypal then it will pull it from your card and you don't have to transfer money every time you want to use Paypal.  Your Credit Card is never used on nor transmitted to any of the stores' payment gateways & is only processed with Paypal. Since Paypal itself has never been hacked, only individual accounts via the usual phishing and such there shouldn't be a problem.  I've had paypal for about 14 years and never had a problem with it being hacked into.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo