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.
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This is an accepted 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