To start create a new Rails app in the terminal:

rails new app_name -T

Where -T determines we don't want to include mini tests in our applicartion

• Add files to the new project to Git

git add .
git commit -am 'Added initial files'

• Now create the app on Heroku

heroku create --region eu
# this will create the app in EU. Optionally you can try to create the 
# app with a name like so: heroku create <app_name> --region eu
# but most names you try are unavailable

• Make note of the name the command above will return. This is the app URL we will need shortly:

<https://whatever-name.herokuapp.com/> | <https://git.heroku.com/whatever-name.git>

Now create a Shopify App

Make note of the url for your Heroku App

Now amend your Gemfile and add the shopify app gem before the rails gem:

gem 'shopify_app'

Move the sqllite gem to develop/test only group

Create a new production env group and add the pg gem:

gem 'pg'

Install the gems

Commit your changes to git

Then push to Heroku: