Yeah of course it's not a technical problem.
I only talked about countries under USA influence due to that. It's a problem of political will of vassals who are comfortable in their vassal status.
BTW Chinese credit cards UnionPay (Chinese equivalent to MasterCard/Visa) are accepted almost in all Spanish ATM and shops, although no Spanish banks issues those cards.
I opened a thread about e-CNY, electronic renminbi, days ago here, and it was closed due to "Advertising"

, in China subforum.
I know Iran has a own electronic system to sell petrol.
I didnt know Iran has own credit card system, what is the name? can it be used outside Iran? Here Russian MIR system can't be used, but Chinese UnionPay yes. What's the most used payment system in Iran?