Klarna · pay later
Klarna integration in your checkout
A Klarna integration lets the customer pay later or in instalments inside your checkout, while you typically get paid by Klarna and leave the credit risk with them. It can pay off when the average basket is high enough that 30 days or instalments move the decision — often from around DKK 800 and up, and when you sell to consumers in DK, SE or NO. It does not pay off on a DKK 149 basket, in B2B with a 14-day invoice, or in categories Klarna refuses. The expensive part is not the button. It is keeping your order states and Klarna’s order states from drifting when you capture, cancel and refund.
7 min read · Updated 28 August 2026
Show Klarna next to MobilePay. Let the customer choose. Do not force pay-later onto a B2B invoice that already is “pay later”. Payment modules.
When a Klarna integration can pay for itself
Do it
- Average basket where 30 days or instalments move the decision (typically DKK 800+)
- You sell to consumers in DK/SE/NO
- You can accept Klarna’s branded flow
Skip it
- B2B with an e-conomic invoice and 14-day terms
- A DKK 149 basket — the fee eats the margin
- You sell something Klarna refuses (certain categories)
What has to be built
Session
Checkout creates a Klarna session with lines, VAT and a delivery address.
Credit
Klarna approves or declines. A declined credit must not start the warehouse.
Capture
You capture when you ship — or cancel if you cannot deliver.
Refund / backorder
Partial refunds match backorders so finance and Klarna do not diverge.
The expensive part is not “the Klarna button”. It is keeping your order states and Klarna’s from drifting apart.
Klarna is one integration. The transaction fee is Klarna’s, not Ceptiv’s — check their current terms. The build sits in the Small package if it is the only one you need: DKK 18,000 + DKK 600/month. See pricing.
Send average basket, country and whether MobilePay already sits in the same checkout. Then we will say whether Klarna is a lift or a fee.
FAQ: Klarna integration
Can Klarna and MobilePay run side by side?
Do we get the money immediately?
What about backorders?
Does it work in B2B?
Want us to build it for you?
You get a fixed-price proposal within 24 hours.
