Hi abhishekt,
Thanks for the reply and pardon the late response. If you have the ZAK, meeting_id, user_id, you could pass them into the StartMeetingParamsWithoutLogin object and use that to start/join a meeting. Here is the doc that describe this:https://marketplace.zoom.us/docs/sdk/native-sdks/android/mastering-zoom-sdk/start-join-meeting/api-user/start-meeting, and here is the implementation that you could try in our demo app:https://github.com/zoom/zoom-sdk-android/blob/master/mobilertc-android-studio/sample/src/main/java/us/zoom/sdksample/startjoinmeeting/apiuser/ApiUserStartMeetingHelper.java
Hope this helps. Thanks!