Payment gateway providers
phpLists payments are processed via two different gateway providers: WorldPay and PayPal. Credits will be added to your account as soon as payment confirmation is received by phpList from the payment provider.
Credit card payments via WorldPay are generally processed instantly. Paypal occasionally delays payment processing. In such cases your payment status may be listed as “status: pending” in your PayPal account. As soon as the payment is processed your account will be updated to reflect the payment.
WorldPay can process Visa Electron payments only for UK merchants, with payment and settlement in GBP. These transactions are processed as a debit card transaction.
More on WorldPay accepted card types: https://support.worldpay.com/support/bg/index.php?page=start&sub=rbsworldpay&subsub=cards