Hi,
At the moment on this mailer we can only operate using Paypal. If you dont have a Paypal account you can still use the check out as guest and use the card payment system in Paypal. Alternatively you can send me a payment to my Wise account: https://wise.com/pay/me/darrenl532 and then send me a support ticket with details on the amount and the membership you have upgraded to.
I hope this helps.
Darren :-)