1 : Does Visa have any types of prepaid gift cards so i could donate using that card ? is it even possible ?
2 : im using a VPN to be able to view the Paymentwall portal . is it ok that there is a third party VPN between the donation process ? or should i tell my friends or relatives in foreign countries to donate for me ?
Prepaid Visa cards might work but there is a chance that they won't. Especially if they are from a country that Paymentwall does not accept payments from. Using prepaid cards like Mint or Paysafecard would be safer. You can buy Mint cards online but Mint belongs to Paymentwall so you might not be able to buy it from the official website.
Mint official website: https://www.mintprepaid.com/
A reseller, in case you want to buy a Mint card but can't buy it from the official site: https://www.offgamers.com/game-card/...repaid-card-eu
VPN should not cause issues when donating, as long as donation window shows up and has the payment method that you want to use.