Signing the application (with a valid organization root certificate) and verifying it at startup. What does it mean?

Question

Android

The customers requested that the application be signed with a valid organization root certificate.
What is it and where to look?

Answer 1

About android: developer.android.com/intl/ru/tools/publishing/app...
About iOS: https://developer.apple.com/support/code-signing/
About root certificates(sic!): https: //www.emaro-ssl.ru/blog/root-certificate/
About signature verification in android: https://habrahabr.ru/post/179487/
I don't know about iOS verification.
Well, in general, you need to study this information and dance from it.