What is the primary requirement for utilizing push notifications?

The primary requirement for utilizing push notifications is user permission. This is crucial because push notifications are a means of communicating with users, often sending alerts, messages, or updates directly to their mobile devices.

In order to maintain user privacy and compliance with regulations, apps must obtain explicit consent from users before they can send push notifications. This consent usually takes the form of an opt-in prompt, which allows users to decide if they want to receive notifications from the application. This requirement is in place to ensure that users have control over their own experience and are not subjected to unsolicited communications.

User preference can play a role in how notifications are managed after permission is granted, but it does not supersede the necessity for initial permission. User registration and user profile completion can enhance the experience and relevance of the notifications being sent, but they are not fundamental requirements for enabling push notifications themselves. Thus, obtaining user permission is the core requirement for the effective use of push notifications in any mobile application.