The app is super straight-forward except the fact that it doesn't work :'( It makes me so sad because I just needed 1 tag for my store in order to give customers access to specific features but alas, no tags are applied when the customer purchases my service. If you fix your app I'd happily use it and change this review to 5 stars.
So sorry to hear you've run into trouble with the order tagger. Sometimes there are incompatibilities with an aspect of other apps installed on your shop. Sometimes we can fix it easily. We apologize for the inconvenience it might have caused you. We tried to contact you a couple of times to check why the app didn't work correctly. We are still interested to take a look and help you sort out the issue. Please reply to our emails.