Buy now pay later for ecommerce: how installment payment works and what it costs the merchant
Buy now pay later (BNPL) lets a customer receive the product immediately and pay in three or four interest-free installments, or in a longer monthly plan. At checkout the option appears next to card and wallets; upstream, the settlement still runs through payment infrastructure, because each installment is charged with the same card processing rails as any other transaction. The most common model in Europe is pay in 3 or pay in 4, popularized by providers such as Klarna, Scalapay, Clearpay and PayPal's pay-later services, while longer plans sit in traditional credit territory. The framework changes with the revised Consumer Credit Directive (EU) 2023/2225, which for the first time explicitly includes BNPL services in the EU consumer credit perimeter, with transposition due by 20 November 2025. This guide covers how the model works, who pays the fee, what the directive changes and how a merchant activates installments on its ecommerce.
Buy now pay later: what it means and how the model works
The meaning of buy now pay later is literal: buy now, pay later. The customer selects an installment option from a BNPL provider at checkout, receives the order exactly as with any other payment, and repays in 3 or 4 interest-free installments or in a fixed monthly schedule.
What happens behind the checkout is a step most shoppers never see: the BNPL platform acts as an intermediary. It charges the installments to the customer on the agreed dates, advances the full order amount to the merchant (typically within days of the order, depending on the settlement terms in the contract) and charges the merchant a commission on the transaction value. In this architecture the default risk on the end customer sits with the BNPL provider, according to the collection policies in its terms.
For the merchant, day-to-day accounting stays ordinary: reconcile customer installments, the receivables that arrive periodically in your favor, and a single cost line, the provider commission, classified among commercial fees.
Who pays the BNPL fee and how it compares with IC++ pricing
In pay in 3 and pay in 4 the customer pays no interest: the cost sits with the merchant, who pays a variable percentage and/or a fixed amount per installment transaction. The first question before enabling the option is how much the fee weighs on expected revenue: installments help conversion, but the cost eats margin on every order that uses them.
A detail worth planning for: BNPL transactions still move through acquiring rails, because the installments are charged to cards or other payment instruments. Your gateway's conditions therefore count twice, on regular settlements and on installment flows. With IC++ pricing the interchange, scheme fees and markup are broken out separately: the merchant sees exactly how much of a percentage is network cost and how much is markup, instead of one blended number. RoxPay's published structure, €0.15 + 0.35% to 0.85% (IC++), makes every component explicit, and that visibility on high-frequency, low-ticket flows is exactly where flat percentages hide real network costs. For a market view, compare our [payment gateway fees comparison](/en/resources/payment-gateway-fees-comparison).
How to activate installment payment on your ecommerce
Offering BNPL takes three configurations, whichever BNPL provider you choose.
1. Enable the installment wallet on checkout. The provider (Klarna, Scalapay, Clearpay and others) ships a dedicated checkout setup with negotiated per-transaction terms: this part depends on the BNPL operator and should be evaluated on your typical ticket size.
2. Choose a gateway that handles the flow properly. Authorization, confirmation, refunds and reconciliation still run through the gateway: prefer a provider with clear transaction-state handling and dispute management. For the technical foundations see our guide on [ecommerce payment API integration](/en/resources/ecommerce-payment-api-integration-guide).
3. Define returns and refunds explicitly. When a partial refund lands after one or more installments were charged, the remaining installments are recalculated and the compensation between provider and customer follows the contract: a scenario to define with the BNPL operator before going live.
The regulatory framework: Directive (EU) 2023/2225 on consumer credit
BNPL sat outside the EU consumer-credit perimeter for a long time, because free short-duration plans did not look like credit operations under Directive 2008/48/EC. Directive (EU) 2023/2225, published in the Official Journal of the European Union on 31 October 2023 and in force from 18 November 2023, brings BNPL services explicitly into the consumer credit perimeter, with a transposition deadline of 20 November 2025 for member states.
What it means for online sellers: first, mandatory transparency on costs, with standardized information disclosed to the consumer before an installment checkout. Second, creditworthiness checks: reduced-amount plans, previously excluded, become subject to the same solvency criteria as other credit products. Third, more balanced rules on debt-collection practices applied by providers. For merchants this translates into contracts with BNPL providers that comply with the new regime, and standardized information flows to expose at checkout.
Eligibility: BNPL is a restricted category
Financial services and installment platforms are not part of standard onboarding: RoxPay evaluates these requests case by case and requires additional documentation. Contact the team to verify your eligibility. The up-to-date sector rules are on the [accepted business categories](/en/general-information/accepted-business-categories) page; credit-risk discipline applies to any merchant offering deferred payment.
Frequently Asked Questions
What does buy now pay later mean?
It is exactly what it says: the customer receives the good immediately and settles the amount in 3 or 4 interest-free installments or a monthly plan. The installments are handled by a dedicated operator that advances the money to the merchant and collects from the customer, keeping a commission paid by the merchant.
Does buy now pay later charge interest to the customer?
In the pay in 3 or pay in 4 model common in Europe the customer pays no interest: the only potential extra cost is a late-payment penalty under the provider's terms. Longer plans can include interest or administrative fees, so always check the terms of the specific installment operator before checkout.
Who pays the buy now pay later commission?
In the classic pay in 3 and pay in 4 model the commission is on the merchant, as a percentage plus possible fixed amounts per installment transaction. Directive (EU) 2023/2225 makes the consumer side more transparent with standardized disclosure. On the merchant side the exercise is weighing the BNPL provider's fee against the card processing costs of the underlying instrument.
Which BNPL providers operate in Europe?
The most visible names on the European market include Klarna, Scalapay, Clearpay and PayPal's pay-later services. The right fit depends on your vertical (fashion and lifestyle lead adoption), average ticket and checkout setup. Always compare contracts, available integrations and per-transaction economics across providers.
What documentation does RoxPay ask for to onboard a merchant offering installments?
BNPL falls under restricted categories: RoxPay evaluates these requests case by case and requires additional documentation. Contact the team to verify your eligibility. Typical requests include company registration and statute, a description of the business model (direct sales or an installment platform), expected volumes and the composition of funding channels. The full sector document list is on the accepted business categories page.
Does BNPL pay off for an ecommerce business?
It pays off where the average cart and the customer segment reward it: an installment wallet raises conversion on mid-size carts and lowers friction on amounts above a single customer's budget. The cost to weigh is the BNPL provider commission, which stays with the merchant on every installment order: design the launch together with your gateway's setup and decide with real numbers (conversion, settlement mix, costs) which product categories get the option. Activation still requires an eligibility review: RoxPay evaluates these requests case by case and requires additional documentation.
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