1Install the plugin like any Joomla extension
2Enable it in Joomla plugin manager
3Go to VirtueMart 2 > Payment methods
4Click "new" and select "VM - Payment, Authipay"
5Name it and "Save" to have the configuration tab enable
6Add your Authipay settings and "Save"
7Publish the Payment Method and "Save & Close"
Authipay will provide you with an easy test setup before going live.
For the last testing on a live website, highly recommended to check user experience, and required by Authipay, you can use a specific VM shopper group, to hide it from actual customers.