What is API (Application Programming Interface)?
An API is a defined set of rules and endpoints that lets one software system request data or trigger actions in another.
Definition
An Application Programming Interface (API) is a contract that specifies how external software can interact with an application without needing access to its internal code. It defines the available operations, the structure of requests and responses, and the rules for authentication and error handling. APIs let separate systems exchange data and invoke functionality programmatically, which is the foundation of nearly all modern software integration. In an ERP context, APIs are how third-party tools, custom applications, and other business systems read from and write to the ERP in a controlled, supported way.
How API Works in ERP
Modern ERP platforms expose APIs so that e-commerce stores, CRMs, warehouse systems, and bespoke apps can push and pull records such as orders, customers, and inventory levels. Instead of editing the ERP database directly, integrations call the published API, which enforces the system's validation and business logic. This keeps data consistent and means upgrades to the ERP rarely break well-behaved integrations. Vendors typically version their APIs so that older integrations continue to work as the platform evolves.
ERP Vendors with Strong API
Oracle NetSuite
The original cloud ERP — built for fast-growing companies
SAP S/4HANA Public Cloud
Standardised cloud ERP with quarterly auto-upgrades and low TCO
Microsoft Dynamics 365
Modular ERP + CRM tightly integrated with Microsoft 365
Acumatica
Resource-based cloud ERP — unlimited users, pay by usage
Frequently Asked Questions
What is the difference between an API and an integration?
An API is the published interface a system offers; an integration is the actual working connection built using that API to move data or trigger actions between two systems.
Do all ERP systems provide APIs?
Most modern cloud ERP systems provide documented APIs, but older or heavily on-premise systems may offer only limited APIs or rely on file-based and database-level integration instead.