Kestrel WMS

Integrations

Connect the systems your warehouse already uses.

Kestrel connects to ShipStation, direct carrier accounts, and QuickBooks Online, and offers a partner API and webhooks for your own systems. Each connection is configured for your warehouse account. Below is what each one does, how it's set up, and where it stops.

ShipStation

Shipping

Configured warehouse accounts can rate-shop and create supported shipping output through ShipStation workflows.

  • Carriers and services come from the ShipStation account you connect.

Limits

  • Carrier coverage depends on the carriers enabled in your ShipStation account.
  • Rates are those your ShipStation account returns; Kestrel does not guarantee the lowest rate.
  • Label voids and postage refunds are confirmed in ShipStation, not in Kestrel.
Availability
Available · warehouse admin setup
Setup
A warehouse admin connects your ShipStation account with API credentials in Settings → Integrations. A client's own ShipStation account can also be connected to their client account.

Direct carrier connections

UPS · USPS · FedEx

Configured direct UPS, USPS, and FedEx connections may provide supported rate responses.

Limits

  • Direct carrier connections return rates only.
  • Label purchase, tracking, and voiding are not provided through a direct carrier connection. Labels are purchased through ShipStation.
Availability
Available · rates only
Setup
Carrier API credentials — plus the account number for UPS and FedEx — are added to a client account by a warehouse admin or the client's admin.

QuickBooks Online

Accounting

Configured warehouse accounts can hand off supported invoices and reflect supported payment status.

Limits

  • Not a full accounting sync: bills, payroll, and other QuickBooks record types are not included.
  • Kestrel does not calculate sales tax.
  • Multi-currency is not supported.
Availability
Available · warehouse admin setup
Setup
A warehouse admin connects one QuickBooks Online company by signing in with Intuit in Settings → Integrations.

Partner API

Developers

Approved endpoints support warehouse- and client-scoped partner workflows.

  • API keys carry specific permission scopes and can be limited to a single client account.
  • The published v1 reference lists every available endpoint and scope.

Limits

  • Only the endpoints and scopes in the published v1 reference are supported.
Availability
Available · v1
Setup
Warehouse admins and client admins create API keys in the Developers area of Kestrel.
Read the v1 API reference

Webhooks

Developers

Approved events can be delivered with signed, retryable webhook requests.

Limits

  • Delivery is asynchronous. Kestrel does not guarantee real-time delivery or a delivery time.
Availability
Available · API setup
Setup
A warehouse admin creates webhook subscriptions through the API.

Integrations are set up for each warehouse during onboarding, and what's available can depend on the accounts you connect. Your pilot consultation confirms which connections your warehouse will use.

Schedule a pilot consultation