Give your European customers the Klarna options they now expect at checkout — pay now, pay later, or pay in installments — without leaving Odoo. This is a build-to-order module engineered by ECOSIRE and installed on your Odoo 17, 18 or 19 instance (Community or Enterprise). It is not an instant apps.odoo.com download; we build it to fit your acquiring setup, your regions and your reconciliation workflow, then hand you the code.

At its core the module is a native Odoo payment provider. It extends payment.provider with a klarna code and its own payment.transaction handling, so Klarna behaves like any other acquirer across eCommerce checkout, the Sales portal ("pay online") and invoicing. Customers are redirected to Klarna's Hosted Payment Page (or an embedded session, depending on your plan), authorize the order, and land back on the Odoo confirmation page with the transaction state synced. Because it uses the standard provider abstraction, your existing sale.order → account.move flow, sales teams and reporting stay exactly as they are.

Under the hood we implement the Klarna Payments and Order Management APIs against your credentials, stored on the provider record and referenced by ir.config_parameter where appropriate. Server-to-server calls are made from Python controllers; every state change from Klarna arrives on a public webhook controller that verifies the payload, matches it to the right payment.transaction by reference, and moves the transaction to authorized, done, cancel or error. That gives you truthful order states even when a shopper closes the tab mid-flow — no more "paid in Klarna, pending in Odoo" mismatches.

On-site messaging is included: a QWeb/OWL promotional widget renders Klarna's "3 interest-free payments of €X" placement on product and cart pages, driven by the live cart total and your configured locale and currency, so the offer your shopper sees matches what Klarna will actually approve. Merchant operations are first-class too — capture on shipment, partial or full refunds, and cancellations are exposed as buttons and server actions on the order/invoice, writing back to Klarna's Order Management API and logging the result to the chatter.

The build covers multi-currency EU operation (EUR, SEK, DKK, NOK, GBP, PLN and more), per-country method availability, test/production toggle, and access control via ir.model.access.csv plus record rules so only authorized users can capture or refund. You get the full module source, a configuration handoff, admin documentation and a support window — delivered in 2–4 weeks and supported afterward.