Post Purchase Extension Code not triggering on Payments Page

[engineerhead]

I am working on a Post Purchase extension to show Upsell. It works on localhost. So! I deployed the code to shopify servers and published it. However it isn't getting triggered on Payments page as it should. The development store is https://wyqueststore.myshopify.com/ and password is napeen

[engineerhead]

So! After pushing the code to Shopify's server, we also need to enable the app in Store's settings.