I'm going through the article at https://developer.zendesk.com/documentation/apps/build-an-app/building-a-server-side-app/part-5-secure-the-app/ to try to implement authentication for a server-side app. It works great for my subdomain. However, when I try to install it on another account (with a different subdomain), there is an error when attempting to open the JWT token.
Additionally, I would like to ask how I can obtain the installation ID of the app, which is used to open the JWT token. This ID should be unique for each installation.
