NetSuite offers multiple integration mechanisms to connect with external systems like ERPs, warehouses, and tax portals.
1. RESTlet
Purpose: Lightweight REST API built in SuiteScript.
Best for: Custom integrations where you control request/response.
Example: Send invoice data to external system.
2. SuiteTalk (SOAP and REST Web Services)
Purpose: Official NetSuite web services API.
Best for: Enterprise-level integrations with structured schemas.
Supports: CRUD operations, search, and complex record hierarchies.
3. Integration Flow Example
Scenario: Integrating NetSuite with a Warehouse Management System (WMS).
1. WMS calls a RESTlet → Sends shipment data.
2. RESTlet validates and creates Item Fulfillment record in NetSuite.
3. Scheduled script updates status and sends confirmation back via REST API.
4. Best Practices
Use token-based authentication (TBA) instead of basic auth.
Implement proper logging and error handling.
Limit data payload size and use pagination where possible.
Always sandbox test integrations before go-live.