I have a social media application that's about 90% complete. The 10% thats incomplete includes the implementation of notifications. They should be like Instagram.
- \(User) has liked your post.
- \(User) has requested to follow.
I have heard OneSignal or Backendless was the best way to achieve this.
People are on [url removed, login to view] doing this for cheap. Please don't try overcharging.