Needs to integrate Custom Notification within own within Website application(React) and Mobile App (Android+Kotlin) - remotely -via AnyDesk -- 2

Needs to integrate Custom Notification within own within Web application(React) and Mobile App (Android+Kotlin) - remotely -via AnyDesk Detailed Requirements - -On New Course/Subject/Subject Slot Launch Notification - Payment, Renewal Notification to specific users..w.r.t. enrolled Course/Subject/Subject Slot - Advance Booking - Course/Subject/Subject Slot class cancelled Notification to specific users..w.r.t. enrolled Course/Subject/Subject Slot Technologies - ReactJS(Web), Node.Js , MongoDB(back end), Android Kotlin(Mobile App) Skills: Android, Node.js, React.js, Kotlin, MongoDB