That's the odd thing! The error is that the request header (HMAC) sent in from Shopify is different from the calculated HMAC header.When running and calculating the header via the console it calculates the same when I put in all the data via local, b...

Yes, we have different apps, and different tokens + secrets. All of that is ok. I'm wondering if there's something weird with Unicorn (server) vs Webrick (server local) and the Ruby implementation.

I have a Rails app.  We have validation code similar to the example code here:https://github.com/Shopify/example-ruby-app/blob/master/02%20Charging%20For%20Your%20App/app.rb#L148(though updated since that's 2016)  api_secret = Rails.application.confi...