Firebase Database REST API - API Usage
You can use any Firebase Realtime Database URL as a REST endpoint. All you need to do is append .json to the end of the URL and send a request from your favorite HTTPS client. HTTPS is required. Firebase only responds to encrypted traffic so that your data remains safe.
so you need https
The WordPress REST API provides REST endpoints (URLs) representing the posts, pages, taxonomies, and other built-in WordPress data types. Your application can send and receive JSON data to these endpoints to query, modify and create content on your site.
If you see the Youtube FREE WordPress Tutorials there are a lot solutions
see the channel
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- Firebase has REST API ( needs https)
- WordPress also has
- see FREE tutorials for WordPress (I gave one channel) for travel booking
I hope to help