Request REST API access by emailing api@extensiv.com and completing the API Integration Survey; once provisioned, obtain your Customer ID, Client ID, and Client Secret from the Extensiv admin.
Exchange credentials for an access token: Base64-encode the string ClientID:ClientSecret and POST it to the token endpoint; include the token in the Authorization: Bearer header on subsequent calls.
Refresh the access token every 50–55 minutes before expiry; the token is valid for approximately one hour and expired tokens produce silent 401 errors.
Create an outbound order by POSTing to the orders endpoint with the customer ID, ship-to address, carrier/service, and line items (SKU, quantity, unit of measure); Extensiv returns an order ID.
Query inventory levels via the inventory endpoint filtered by customer ID and SKU to reconcile stock positions between your commerce platform and the 3PL warehouse.
Subscribe to order status webhooks or poll the order endpoint to detect when orders are picked, packed, shipped, and when a tracking number is assigned; propagate tracking to your customer-facing channels.
Known gotchas
Access token expiry is approximately one hour; build proactive token refresh logic (every 50–55 minutes) to avoid mid-operation failures during long-running batch jobs.
All API operations are scoped to a Customer ID within the 3PL account — always pass the correct Customer ID or inventory and order queries will return empty or cross-contaminated results.
The Extensiv API uses its legacy 3plcentral.com domain for some endpoints; check the current base URL in the developer portal (developer.extensiv.com or developer.3plcentral.com) at integration time as migration paths may differ by account.
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp