What are the online payment systems available in Vietnam?

Hi TIA community,

I’ve been trying to do some research regarding online payment systems in Vietnam.

Most of the feedback I gathered is that in Vietnam, online payments systems are still in the early adoption stage.

Some research from 2013 indicated that PayPal itself is not active in Vietnam due to a significant spam and fraud issues. I heard that even accessing PayPal from a Vietnam IP address would actually lock your account.

More recently it seems that PayPal is now functional and operational for certain businesses within Vietnam. 

Does anyone know about the degree of penetration PayPal has in Vietnam? What are the adoption statistics like? Or are there other more dominant online payment systems leading the market?

Thanks a lot for your time guys!