Yes this does show up . Wplms app has two options internally in app to purchase the course .
1. Using Wallet .
2. from site .
Seems like you have not enabled wallet in your app config and hence its not showing . see " Enabling Wallet in App " section in this course : https://wplms.io/course/getting-started-with-wplms-mobile-app/
from site option will open in app browser on which user has to login and purchase the course . Once payment is successfully completed on the browser it will be closed automatically and course will be assigned to user .
user can goto profile tab -> my courses to check his newly added course .