Hey @woprese,
So with this plugin there are 2 types, the first is free, just using the plugin as is, will give you the ability to “take payment” where it doesn’t actually take the payment but presents the user with all the correct details to go away and make the payment, for you to then monitor your own wallet to check that the transaction has come through. Then you can manually process the order once you’re happy the payment is in your wallet.
While this method works, it’s a bit time intensive, which is why we created the pro account: https://www.paywithether.com/product/pay-with-ether-pro/
This way, you get an API key to add into the admin area, which then gives you access to our server which checks for your transactions on an ongoing basis, which will then mark the order as processing.