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3PL Central API

3PL Central (now Extensiv 3PL Warehouse Manager) is a cloud warehouse management system used by third-party logistics providers to run receiving, inventory, order fulfillment, small-parcel shipping, and billing across multi-client warehouses. An unofficial API lets you programmatically pull orders, inventory items, stock summaries, receipts/ASNs, customers, and shipments—and push new orders, receipts, inventory adjustments, and shipping updates back into 3PL Warehouse Manager.

By Alex Klarfeld•May 30, 2026
3PL Central API

What is 3PL Central?

3PL Central (rebranded as Extensiv 3PL Warehouse Manager in 2022) is a cloud-based warehouse management platform that runs day-to-day operations for third-party logistics providers. Warehouses use it to manage receiving, inventory, order processing, small-parcel shipping, and billing across multi-client operations—acting as the system of record that other warehouse technology connects to.

Core product areas include:

  • Receiving (manual receipts, barcode scanning, file uploads, EDI/API connections, charge capture)
  • Inventory Management (items with SKU, serial numbers, expiration dates; allocation, counting, adjustment, transfers, assemblies)
  • Order Processing (single and batch order processing, real-time status, packing slips, returns)
  • Small Parcel Suite (carrier rate shopping, label printing, FedEx/UPS/USPS and ShipStation integrations)
  • SmartScan mobile barcode scanning for receiving and picking, plus dock scheduling automation
  • Billing automation with QuickBooks integration, dashboards, and analytics

Common data entities:

  • Orders, Order Items, Allocations, Pick Tickets
  • Items/SKUs, Stock Summaries, Inventory Adjustments, Transfers, Assemblies
  • Receipts/ASNs, Receive Items, Dock Appointments
  • Customers, Warehouses, Locations, Carriers
  • Shipments, Tracking, Packages, Billing Charges

The 3PL Central Integration Challenge

3PLs run mission-critical fulfillment on 3PL Warehouse Manager every day, but turning its portal- and EDI-driven workflows into reliable, API-driven automation is non-trivial:

  • Credential-gated REST access: the external REST API requires Client ID/Client Secret credentials generated per-tenant in the Support Portal, with direct developer support gated behind a Developer Enablement package
  • Multi-client tenancy: each warehouse hosts many customers with their own SKUs, billing rules, and order profiles—generic integrations break across customer boundaries
  • Subscription-tiered features: capabilities like real-time order status differ across Enterprise, Professional, and lower subscription levels
  • Mixed integration surfaces: data flows through the REST API, EDI, file uploads, and the Extensiv Integration Manager (formerly CartRover) marketplace, each with its own shape
  • Token lifecycle handling: Base64-encoded ClientID:ClientSecret exchanges produce access tokens that must be refreshed and replayed correctly for headless automation
  • Billing and charge accuracy: storage, handling, and value-added service charges require precise capture and reconciliation against each customer's contract

How Supergood Creates 3PL Central APIs

Supergood reverse-engineers authenticated browser flows and 3PL Warehouse Manager's REST surface to deliver a resilient API layer for your tenant—spanning receiving, inventory, orders, and shipping across every customer in the warehouse.

  • Handles Client ID/Client Secret token exchange, MFA, and portal sessions securely
  • Maintains session continuity with automated token refresh and change detection
  • Normalizes responses across orders, items, stock summaries, receipts, and shipments so you integrate once per tenant, not once per customer
  • Respects multi-client boundaries, subscription tiers, and customer-specific billing rules to ensure compliant access

Use 3PL Central with AI agents: 3PL Central MCP Server →

Getting Started

  • Schedule Integration Assessment

Book a 30-minute session to confirm your warehouses, customers, subscription tier, and authentication model.

  • Supergood Generates and Validates Your API

We deliver a hardened 3PL Warehouse Manager adapter tailored to your tenant, customers, and entitlements.

  • Deploy with Monitoring

Go live with continuous monitoring and automatic adjustments as 3PL Warehouse Manager evolves.

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API Endpoints

Authentication

POST/authenticate

Exchange Base64-encoded Client ID and Client Secret credentials for an access token used on downstream calls.

Orders

GET/orders

List orders across customers with filters for status, customer, warehouse, and date range.

Orders

POST/create_order

Create a new outbound order with line items, ship-to address, and carrier preferences for a customer.

Inventory

GET/stock_summaries

Retrieve item stock summaries and on-hand quantities by SKU, location, and customer.

Receiving

POST/create_receipt

Submit an ASN/receipt with expected items and quantities for an inbound shipment.

Shipping

GET/shipments

Pull shipments, packages, tracking numbers, and carrier status for fulfilled orders.

Use Cases

Sync orders and fulfillment status to ecommerce and ERP

- Pull new and updated orders across every customer into a single warehouse-wide feed - Push fulfillment status, tracking numbers, and shipment confirmations back to storefronts and ERPs - Reconcile cancellations, backorders, and partial shipments without portal clicks

Keep inventory and stock summaries in sync

- Stream stock summaries and on-hand quantities by SKU and location to downstream systems - Post inventory adjustments, transfers, and cycle counts back into 3PL Warehouse Manager - Surface low-stock and expiration alerts to replenishment workflows

Automate inbound receiving and ASNs

- Create ASNs/receipts programmatically from supplier and customer feeds - Track receipt status from open through closed and capture handling charges - Match received quantities against expected and flag discrepancies

Reconcile billing and shipping charges

- Pull storage, handling, and value-added service charges per customer - Match small-parcel shipping charges to orders and carriers - Feed reconciled charges into QuickBooks and accounting systems

Technical Specifications

Authentication

Base64-encoded Client ID/Client Secret exchanged for an access token, plus portal session and MFA handling in a managed session

Connectivity

3PL Warehouse Manager external REST API plus authenticated browser flows where endpoints are not exposed

Response format

Normalized JSON across orders, items, stock summaries, receipts, and shipments

Rate limits

Adaptive throttling tuned to your tenant to stay within Extensiv-side limits

Session management

Automatic access-token refresh, credential rotation, and MFA replay handling

Data freshness

Near real-time pulls for orders, inventory, and shipments with optional scheduled batch syncs

Security

Encrypted credential vault, scoped access tokens, SOC 2-aligned controls, and audit logging

Webhooks

Event-style callbacks for order creation, shipment, receipt closure, and inventory adjustments

Latency

Sub-second reads on cached entities; multi-second writes when posting orders and receipts

Throughput

Horizontally scaled workers sized to multi-client warehouse order volume

Reliability

Retry, backoff, and idempotency keys for order, receipt, and inventory transactions

Adaptation

Continuous monitoring of Extensiv releases, Integration Manager changes, and tenant configuration drift

Frequently asked questions

Yes. 3PL Central was rebranded as Extensiv 3PL Warehouse Manager in 2022; Supergood works against the same platform and its external REST API regardless of the branding shown in your tenant.

No. Supergood works with your existing tenant credentials and authenticated sessions. We generate or use your Client ID/Client Secret so you do not need to stand up direct developer support yourself.

Supergood normalizes data across every customer in the warehouse while preserving customer boundaries, SKUs, and billing rules, so you integrate once per tenant rather than once per customer.

Yes. You can pull orders, inventory, stock summaries, receipts, and shipments, and push new orders, receipts, inventory adjustments, and shipping updates back into 3PL Warehouse Manager.

Some features such as real-time order status vary by subscription level. Supergood adapts to your tier and surfaces the entities your plan exposes, falling back to authenticated flows where the REST API does not.

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