API Docs
Updates

Changelog

Track API changes, new features, and updates. All endpoints are currently under the v0 prefix as we iterate toward a stable v1 release.

Versioning

The API uses URL-based versioning with the prefix /v0/. The v0 designation means the API is functional and production-ready but may receive breaking changes as we refine the interface based on developer feedback.

v0Current — Active Development

All current endpoints live under /v0/. When v1 is released, v0 will continue to work for a deprecation period with advance notice.

Breaking Change Policy

We try to avoid breaking changes, but during v0 they may happen. When they do:

1

Advance notice

Breaking changes are communicated via email to all registered OAuth clients at least 2 weeks before they take effect.

2

Additive by default

New fields, endpoints, and enum values are added without versioning. Your client should ignore unknown fields.

3

Deprecation period

Removed endpoints or changed behaviors will have a deprecation period where both old and new behavior coexist.

Recent Changes

March 2026

Public API Launch

  • OAuth 2.0 Authorization Code flow
  • Shipments API (list, get, PnP, SPD)
  • Inventory API (products, cartons, stock levels, warehouses)
  • Invoices API (list, get, line items)
  • Notifications API (unified feed)
  • Recommendations API
  • Organizations API
  • Sandbox environment available
  • OpenAPI 3.0 specification published

Stay informed

Subscribe to API updates by contacting developer@3plguys.com. All registered OAuth clients automatically receive breaking change notifications via email.