Adding Shopify Bottle Deposit app to my Shopify store

Hi, I have found Canteen app is great for Bottle deposits in Shopify. This article gives a quick overview of the app and the app setup https://sasquatchstudio.co/collect-bottle-deposits-on-shopify-store-and-pos/

I need some help setting up and testing. My goal is to collect bottle deposits for my store and I am pretty sure Canteen App is the one!