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3PLGuys API

Programmatic access to warehouse operations, inventory management, and shipment lifecycle. Build integrations, automate fulfillment, and sync with your systems.

OAuth 2.0REST APIOpenAPI 3.0Sandbox
View DocumentationAPI Reference
api.3plguys.com/v0/shipments
GET /v0/shipments?status=pending&take=5
Authorization: Bearer eyJhbGciOi...
// Response 200
[
{
"id": "42",
"status": "pending",
"type": "outbound-pickpack",
"warehouse": { "name": "Main Warehouse" },
"cartons": [...]
}
]

API Reference

Everything you need to integrate with the 3PLGuys warehouse platform.

Shipments

Create, track, and manage outbound and inbound shipments through the full lifecycle.

List shipmentsGet shipmentCreate Pick & PackUpload SPD labels
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Inventory

Products, cartons, and real-time stock levels across all warehouse locations.

List productsGet stock levelsCreate cartonsUpdate products
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Invoices

Read-only access to invoices, line items, totals, and payment status.

List invoicesGet invoiceLine itemsPayment history
View docs

Warehouses

Warehouse locations, addresses, and operational details.

List warehousesGet warehouseContact infoCapabilities
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Notifications

Unified feed of shipment updates, invoice alerts, and system events.

List notificationsMark as readFilter by typeReal-time feed
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Authentication

OAuth 2.0 flow with scoped access tokens and automatic refresh.

AuthorizeToken exchangeRefresh tokensRevoke access
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View full API reference
Guides & Tutorials

Articles

Quickstart

Getting Started

Go from zero to your first API call in under 5 minutes. Set up OAuth, obtain tokens, and fetch live data.

Shipments

Automating Pick & Pack

End-to-end guide for Pick & Pack orders via API. Draft creation, addresses, items, and tracking.

Integrations

Connecting Shopify

Integrate your Shopify store for automated order fulfillment and real-time inventory sync.

AI & Automation

Building AI Integrations

Use AI agents, MCP servers, and LLMs to automate warehouse operations and build fulfillment bots.

View all articles

Ready to integrate?

Get started with our API documentation, explore the sandbox, or reach out to our team for integration support.

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OpenAPI Spec

Machine-readable API specification

Sandbox

Test without affecting production

SDKs

Client libraries for popular languages