Hi, I live in France and when I have finally completed my website, can I use my sons Paypal which he uses for other services who lives in the UK, and the cash gets transfered to his account?
You should be able to. He'll have to login to his account and create the payment button code to place on your site. As long as you do that then the money will be transferred to his account.
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Don't put the cart before the horse. Plan your website, thencreate it.