Quick lessons learned from setting up payments in a mobile app. I use NativeScript for two apps iOS and android from one codebase. On the subscription screen, I fetch and list options like monthly, yearly, etc. Started with iOS using IDs for subs like app.domain.com.monthly, app.domain.com.yearly, etc., only to find out you cannot use the same IDs on Android as dots are not accepted—only hyphens. :) A small change fixed that, but if you build cross-platform, it might be good to keep these IDs inline - easier with maintenance and webhook logic