Adding node.js to an existing wappler project using docker and digital ocean

Not sure if this is an obvious question but I would like to add node.js to an existing project. I have an e-commerce site that I have been working on and it utilizes stripe (the client-side checkout functionality that stipe created for dummies) It works pretty well as long as you only want to purchase one type of item during a session. I am also working on adding the more complex server-side system with a shopping cart that @Teodor made (thank you very much) but that is for later. My main reason for wanting to add node.js is because I would like to add webhooks and it requires a listening feature so it can notify of activity in a secure way. The success page that stripe responds to is not secure and could be hacked to fake a purchase.

Tthank you in advance!