OnePay Vietnam
1. Activate OnePay as payment gateway
Once you have activated OnePay plugin, you need to validate the licence in HBook > Licence.
Set OnePay as active payment gateways in HBook > Payment > Active payment gateways.
2. In HBook, add OnePay credentials
Set if you are in "Test" or "Live" mode in HBook > Payment > OnePay Vietnam settings.
If you are in Test environment, there is no other settings needed

If you are in Live environment, you will need to add the following information that is communicated by OnePay: Merchant ID, Access code and Hash key.

You will need to set these for each Domestic and International payments.