Concerning JPC & their problematic website not allowing Visa or Mastercard payments, due to their procedure of an initial confirmation request of a payment of 0.00 Euros, which a lot of bank systems don't acknowledge, so that one has to pay JPC using PayPal in stead:
My AVG safety system now blocks any transfer of money to my PayPal account from my bank account via the Trustly company, nonetheless recommended by PayPal itself, resulting in further troubles.
The alternatives for me then are
1) getting a bank transfer via my bank to PayPal, which can in some cases take time; I don't like the insecurity of it, just like I don't fancy the overall involvement of the Trustly company either, including the use of some of my bank codes on the way;
2) getting a friend who has a PayPal account to transfer money to my account, after paying him firstly, say via a MobilePay;
3) using a different computer or phone with a different browser, that hasn't got AVG installed.
2) and 3) are also somewhat inconvenient, or have some insecurities with them ...
So I contacted JPC again, and they now say that they are rethinking their concept and preparing to make substantial changes in payment procedures.