I am following the tutorial and can not overcome step 3. After I complete everything, at the end of part 3 when I go to access my localhost I get the following error:
Expected a valid shop query parameter
To my knowledge I have everything entered exactly as described in the tutorial and can't figure out what is wrong by the message.
Solved! Go to the solution
If you're seeing that in your browser, you'll need to pass the query param of your shop and authenticate your app, it's a bit further down in that step:
You won't be able to just head to your localhost url because the middleware in your server expects you to authenticate your app