APIs (Application Programming Interfaces) in Microsoft Dynamics 365 Business Central provide a standardized way for external applications to communicate securely with Business Central. They enable seamless integration between Business Central and systems such as CRM applications, e-commerce platforms, mobile apps, banking systems, payroll software, and Power Platform solutions. Business Central primarily exposes REST APIs that exchange data using JSON over HTTPS. Developers use APIs to: Create, read, update, and delete business data Synchronize customers, vendors, items, and sales orders Automate business workflows Integrate with Microsoft Power Platform Connect third-party applications Business Central also allows developers to create Custom APIs using the AL programming language, exposing custom tables and business logic while maintaining security through Microsoft Entra ID (Azure Active Directory) authentication and OAuth 2.0. Using APIs ensures scalable, secure, and loosely coupled integrations without directly accessing the underlying database.