Who pays interchange?

On a typical card purchase, the acquirer pays the interchange fee to the issuer. The acquirer then recovers that cost from the merchant through the processing rate or merchant discount rate.

Card networks do not keep the interchange fee itself. They set or publish the relevant rate tables and operate the scheme rules, while charging separate scheme fees for access to their network. For the merchant, the total cost of card acceptance usually includes three main parts: interchange, scheme fees, and the acquirer or PSP margin. This is often called the Interchange++ or IC++ pricing model when those components are shown separately.

Why does interchange vary?

Interchange is not a single flat rate. It changes depending on the card type, transaction type, merchant category, and region.

Debit cards often have different rates from credit cards. Consumer cards are priced differently from commercial or corporate cards. Card-present transactions, where the card is used in person, usually carry a different risk profile from card-not-present payments, such as online checkout. The merchant category code, domestic or cross-border setup, card scheme, and local regulation can also change the final rate.

That is why two merchants with the same sales volume can still pay very different effective card acceptance costs.

Why does interchange matter for merchants?

Interchange matters because it is usually one of the largest parts of card processing fees. Even when a merchant sees only one blended rate, interchange is still included inside that price.

The key question is not only how much interchange costs, but how clearly it is shown. Under interchange-plus or IC++ pricing, interchange is passed through with scheme fees and a visible acquirer or PSP margin. Under blended pricing, those components are combined into one rate, which is simpler to read but less transparent.

For merchants that process high volumes, small differences in card mix, region, routing, or pricing model can have a meaningful impact on margin.

Seeing interchange clearly in processing

Interchange itself is usually set by the card networks or limited by regulation, so merchants cannot simply negotiate it away. What they can control is visibility, routing strategy, and the commercial model used by their acquirer or PSP.

A payment platform with clear reporting can help merchants understand where transaction costs come from, how different routes perform, and how the overall cost of acceptance is structured. Payneteasy supports payment processing with smart routing across acquirers and payment methods, helping merchants review transaction performance, routing options, and fee structure more clearly.