Klar

Import orders, returns, and costs from any custom system into Klar — without a native integration.

Klar API — Introduction

This guide shows you how to connect the Klar Public API to an AI
assistant like Claude using the Model Context Protocol (MCP).

Build a Klar Attribution MCP Server with Claude

Michael Stenger

Frank Birzle

Franz May

Programatically import your data into Klar via Klar API

Klar API

Comprehensive overview and technical guidelines for integrating external systems with the Klar RESTful API.

Developer Guide: Connecting to the Klar RESTful API

Data Mapping: Frontend vs. API Fields

Klar Public API

Valentine Strunz-Happe

Introduction to using the Klar APIs - Read me first!

Klar API - Introduction

How to generate your Klar API token and authenticate your requests using Bearer authentication.

API Authentication

Use this endpoint if COGS (Costs of Goods Sold) are coming from a non-shop system source & order data doesn't contain COGS information.

COGS

Use this endpoint if you want to import complete order payloads, including order statuses, line items, shipping and returns info in one go.

Orders (API Endpoint)

Use this endpoint if returns are part of your orders. Order data is coming via different data source and doesn't contain returns information

Refunds (API Endpoint)

Allows you to upload payment & transaction costs for orders via API

Transaction Costs (API Endpoint)

Use this endpoint to import logistics costs missing in your shop system / are coming via another system, e.g. ERP.

Logistics Costs (API Endpoint)

Endpoints

COGS (object schema)

Customer (object schema)

Discount (object schema)

LineItem object schema for order products.

LineItem (object schema)

Object Schema for the Logistics Costs endpoint of Klar API.

LogisticsCosts (object schema)

Object schema for Klar APi. While those attributes are optional, they are very useful in linking up the order data with your marketing data.

OptionalIdentifiers (object schema)

The Order object — field definitions, types, and example values for the Klar REST API.

Order (object schema)

Refund (object schema)

RefundedLineItem (object schema)

Shipping object schema for shipping revenue, costs, address, tax and shipping discount info

Shipping (object schema)

Tax (object schema)

Object Schema for the Transaction Costs endpoint of Klar API.

Transaction Costs (object schema)

Detailed description of the entities for the Klar API Endpoints

Object Schemas

Example for logistics costs for Klar API.

Logistics Costs

Example for an order submitted via Klar API, paid & delivered, no returns

Order Example #1

Example Order for Klar API, partially refunded

Order Example #2

Refunds

Examples

Klar Website

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