Fill the following environment variables
SHOPIFY_API_KEY= # From Shopify Partner Account App
SHOPIFY_API_SECRET = # From Shopify Partner Account App
FORWARDING_ADDRESS= # Your end-point api
MONGODB_URL = You Mongodb url
Example: Do like this
FORWARDING_ADDRESS = https://yourdomain.com
Don't do like this
FORWARDING_ADDRESS = https://yourdomain.com/
$ npm install
$ cd client && npm install && npm run build
$ npm start