Developer Suggestion - In-app chat API for my Android app?

What characteristics should I seek for in an in-app chat API for my Android app? Do I need to buy a third-party chat api? or to build it?

It is getting harder for developers to keep up with customers’ shifting needs as the demand for messaging apps for their android Apps. People are looking for messaging apps with the best features. Here are a few things that any messaging software needs to have in order to separate out from the competition.

  • Instant texting
  • Voice Call
  • Video Call
  • File sharing
  • Security
  • group chat

I had a options that all in one solution with best chat API providers.
Mirrorfly, contusfly, Applozic .