Klar natively supports a wide range of data sources for importing your order and marketing data. If your data source isn't on that list — for example because you're running a custom shop system, a headless setup, or managing orders through an ERP — you can use the Klar API to push your order and returns data directly into Klar.
The API is RESTful and designed to be straightforward to integrate. Once your data is flowing in, it appears in Klar's profitability and attribution reports just like data from any native integration — giving you the same DB1/DB2 breakdown, ROAS, and CAC calculations regardless of your tech stack.
Using the API requires an active Klar account.
First: authenticate
All API endpoints require authentication. Start here: Authentication
Then: choose your import path
Everything in one object? Use the Orders endpoint to import orders, COGS, logistics costs, and refunds all at once.
Importing data from separate systems? You can use each endpoint independently:
COGS — e.g. from an external ERP
Logistics Costs — e.g. from your 3PL
Refunds — e.g. if your shop system handles orders but not returns
This is especially useful when your shop is already connected to Klar but one part of your data (returns, COGS, logistics costs) lives in a separate system.