2) Ok thanks. Now a "return to the shop" button is available in Paypal. Of course if the customer don't click this button, the DB will never be updated and emails not sent…
Do you know if with Paypal PRO the checkout_success.php page is opened automatically after payment ?
Is Paypal Express a Paypal PRO or Standards (in the Wizard) ?
3) My next work ;-)
4) OK now. Some previous forum threads were very helpfull for this.