Same problem here.
At the moment only solution I found is to deploy it, install it on my customer store and test it on a checkout profile.
Downside of this behavior is that you have to deploy each and every time you do modify your extension.
Same problem here.
At the moment only solution I found is to deploy it, install it on my customer store and test it on a checkout profile.
Downside of this behavior is that you have to deploy each and every time you do modify your extension.