Meta Graph API

The primary HTTP-based interface for programmatically querying data, posting stories, and managing ads across Facebook, Instagram, and WhatsApp.

This RESTful API serves as the central gateway to the Meta Social Graph: a vast network of nodes (users, photos, pages) and edges (comments, likes, tags). Developers use standard HTTP methods to interact with specific versioned endpoints (v19.0 is the current stable release). Whether you are pulling real-time Instagram insights, automating WhatsApp business messages, or managing complex Facebook ad campaigns, the Graph API provides a unified structure for data exchange. It relies on OAuth 2.0 for secure access tokens and returns structured JSON responses, making it the essential tool for any application integrating with Meta’s 3.9 billion monthly active users.

https://developers.facebook.com/docs/graph-api