Buy now pay later is short-term credit granted at the checkout itself: the shopper takes the goods immediately and repays a provider in a few scheduled amounts, while the merchant receives the full order value up front, less a fee. The credit decision belongs to the provider, which underwrites the shopper in seconds and owns the repayment relationship from that moment. That is the strict buy now pay later definition; in shop use the buy now pay later meaning is looser, covering any pay-in-four button at the till.
How does BNPL work, party by party
The shopper picks the option on the payment page and is passed to the provider, which runs a soft credit search plus its own scoring and returns an answer before the page reloads. On approval the order confirms, and the provider funds the merchant on its normal settlement cycle. The shopper then repays the provider, not the store.
The shape of that repayment schedule — four charges over six weeks, or twelve monthly amounts on a larger basket — belongs to installment payments. Charging repeatedly for ongoing access, with no total and no final payment, is subscription billing and behaves nothing like this.
Who eats which loss
The provider absorbs the credit loss: a shopper who stops paying in month three is its problem, and the merchant keeps the money. Everything else flows back to the merchant. Fraudulent orders, returns, disputed deliveries and refunds are recharged under the acceptance contract, so the up-front payment is not final in the way it first looks.
Running the margin math before switching it on
BNPL fees sit well above card rates — commonly four to six percent of order value plus a fixed amount, against roughly two percent for a credit card sale. On a $200 basket that is around $10 instead of $3.
The extra $7 only pays for itself on orders that would not otherwise have happened. If a fifth of BNPL volume is genuinely incremental and the rest is customers switching from cards, the incremental margin has to cover the fee on the whole book, not just the new part. High-margin categories absorb that; thin-margin resellers usually cannot.
What is buy now pay later in regulatory terms?
Consumer credit rules in the UK, EU and Australia have moved BNPL from a light-touch product toward regulated lending, bringing affordability checks, pre-contract disclosure and complaints handling into scope. Approval rates fall when those checks bite, and the checkout gains friction that did not exist before.
Merchants are rarely the regulated party, but they are responsible for how the option is presented and must not imply approval the provider has not given.
Concentration is the merchant's real exposure
If a single provider tightens acceptance, reprices, or exits a market, a measurable share of orders disappears in a week. Carrying BNPL as one alternative payment method among several, rather than as the only credit route at checkout, keeps that dependency survivable.