Unfortunately, i dont live in the USA and i dont' have a credit card.

Paypal is my prefered online payment method. Or if you accept UK Switch / Maestro.

Will send cash as last resort.

can i pay for an upgrade by any other means than credit cards and USA Debit Cards?

We dont' have an automated process set up for non credit card transactions, but we do have a paypal account to receive payments.

I'll send you a PM with more info.