Negotiating PSP fees: Does your payment contract still fit?

Your shop is growing. You’re buying in larger quantities, tightening your logistics, and watching marketing spend closely. But with your payment service provider, you may still be on the contract you signed at the start.

Back then, what mattered was that the checkout worked and the first orders went through. Fair enough. But your business has changed since. Do the terms still match?

A PSP is a payment service provider that handles the technical processing of different payment methods. Which additional services are included depends on the provider and your contract.

Its fees are part of your running costs. Still, it’s worth reviewing them as regularly as you review purchase prices or shipping rates. To do that, you first have to understand what you’re actually paying for.

What are you really paying for payment processing? 

The percentage in the offer is a start. It isn’t a complete cost picture.

Depending on the contract, you can see fixed per-transaction fees, monthly charges, and costs for refunds or currency conversion. Fees can also apply on failed payment attempts. What matters is which events your contract actually prices.

So look at your statements and add the separately billed services. For a first overview, divide total payment processing costs over a period by the corresponding payment volume handled. That gives you your effective cost rate.

Be consistent about the basis: Which fees are included? Are you using volume before or after refunds? Are you comparing the same periods?

Then go a level deeper and break it down by payment method, market, and currency. Otherwise a cost increase quickly looks like worse terms, when what actually changed is your business.

If you’re winning more international customers or processing smaller baskets, that can shift your average cost. You should be able to explain the trend before you talk about a new price.

What’s the difference between blended pricing and interchange++? 

Blended pricing is a pricing model that bundles several cost components into one combined rate. Depending on the contract, different rates apply to specific card or transaction groups. An additional fixed fee is also possible.

At first, that makes the math easy. But you can’t read off directly how much goes to external fees and how much to your provider’s own service.

Interchange++ is a pricing model in which interchange, scheme fees, and the processor’s markup are billed separately. The costs are passed through. The UK’s payments regulator describes this separation in its explanation of IC++ contracts.

That makes the provider’s markup easier to review. It isn’t automatically pure profit, though. It also covers the provider’s own services and costs.

So interchange++ isn’t automatically cheaper. Additional charges can apply here too. Have both models priced out using your actual transaction mix, including every ancillary line item. That’s how you turn two differently structured offers into a usable comparison.

Are interchange and scheme fees negotiable? 

Interchange is a fee that flows from the card-acquiring bank to the card-issuing bank on a card payment. It’s one component of card acceptance costs.

A single scheme fee is a fee charged by the card network. “Scheme fees” is an umbrella term for various charges tied to use and processing inside that network.

For your conversation with the payment provider, the distinction matters. The underlying fees aren’t freely set provider markups that you can reduce by asking for a discount.

But they aren’t flat across every merchant either. For interchange, card type, region, and transaction characteristics play a role, among other things. You can find the categories and conditions in the information on European interchange fees.

Your job is to follow how they’re passed through. Which items are external costs? Which markups come on top? And can they be cleanly separated?

With that foundation, you can talk concretely about the price of the provider’s own service, instead of a lump sum whose composition stays unclear.

Which terms should you check besides the percentage? 

The percentage markup is the obvious one. Depending on your business model, other contract pieces can matter just as much.

Fixed transaction fees 

On small baskets, a fixed amount weighs heavier. Also clarify whether the fee applies to a successful payment, an authorization, or already to a payment attempt.

Refunds and chargebacks 

A refund is a return of funds you initiate. A chargeback is a reversal through the card scheme, for example after a customer dispute. Check which handling fees each triggers and whether the original payment fees are returned on refunds.

Reserves 

A reserve is an amount your payment provider holds back to cover potential risks. It isn’t automatically a fee, but it ties up liquidity. Ask about the amount, the calculation basis, release conditions, and verifiable conditions for a later reduction.

Payout schedule 

What matters is when you can actually access your money. Have them walk you through when a payout is triggered, what delays are possible, and whether faster payouts cost extra.

Minimum fees and contract commitment 

A favorable rate can be tied to minimum volume, long terms, or exclusivity. Check what happens in weaker months or when your plans change.

Not every point can be shifted at will. Reserves and payouts in particular also depend on the risk assessment. But you can insist that the conditions are traceable and that you know when they’ll be reviewed again.

Which numbers should you prepare with Xentral before the conversation? 

For the negotiation, you need a traceable overview of your business. Connect order, invoice, and return data from Xentral with your payment provider’s statements and transaction data. Xentral offers reports for different business evaluations and documents returns with the related records. Which evaluation is directly available depends on your setup and connected data.

Prepare these views:

• Payment volume and transaction count by payment method. Use payments that actually settled. Order value alone isn’t enough, for example on cancellations or partial payments.
• Payment method mix. Show the share of volume and transaction count. Add average payment amounts and relevant countries and currencies.
• Returns and refunds. Separate returned goods from refunds paid out. Show whether your return rate is based on orders, items, or merchandise value. Account for the fact that returns arrive with a lag.
• Chargebacks. Add count, amount, reasons, and trend from the PSP data. For comparison with the provider’s assessment, use their calculation logic. Label a self-calculated rate as such.
• Seasonal patterns. Show the trend by month. Mark promotions, peaks, and changes in assortment or sales markets.

What matters is reconciling across systems. One order can have multiple payments, and one payout can bundle many transactions. Use the available order and transaction references, and document any mappings you can’t close.

Also note which data comes from which system and how current it is. Chargebacks and reserves aren’t necessarily complete in the ERP.

In the end, you should be able to explain what volume you bring, how reliable your processes are, and what changes are coming. That’s how “our shop is growing” becomes a solid basis for a conversation.

How do you turn your numbers into a strong argument?

More volume is an argument. A traceable trend makes it stronger.

Show how your settled payment volume has changed since the contract started. Separate growth already achieved from your plan. Forecasts help, but shouldn’t be presented as locked-in revenue.

Your processes belong in the conversation too. If you’ve shortened delivery times, resolved complaints faster, or fixed root causes of chargebacks, document it. That lets your provider judge whether the original risk assessment still fits.

A concrete comparable offer adds orientation. For that, both offers have to rest on the same assumptions: payment methods, card mix, countries, currencies, transaction count, and scope of service.

Ask for a total-cost comparison based on your data. Ask too which services are billed separately and what conditions apply to the offered price.

You don’t need to threaten to switch. A matter-of-fact framing is enough: “Our business has changed since the contract started. I’d like to review the terms based on our current numbers.”

When is a good time to negotiate? 

Reasonable triggers are a grown payment volume, an upcoming renewal, or a demonstrably improved risk position. Preparing for new markets can also be a good moment to reassess the existing model.

Plan the conversation early enough that you can review offers and clear up questions. Notice periods and possible technical switches belong in your planning.

Before a high-revenue season, you can discuss expected volume. Just before peak, though, you may not have the time to carefully roll out an alternative. Growth can also raise additional explanation needs, for example on preorders or longer delivery times.

Try to agree in the new contract itself when terms will be reviewed again. A clear volume tier or a defined review date saves you later arguments about whether there’s any reason to talk.

Which mistakes make the comparison unnecessarily hard? 

A typical mistake is comparing only the advertised percentage. That leaves fixed fees, refund costs, and extra services outside the math.

Equally problematic is treating returns the same as chargebacks. Both can be economically relevant, but they have different causes and are judged differently.

Unrealistic volume commitments don’t help either. If a favorable price only applies under conditions you later can’t meet, the supposed savings can disappear.

On a possible switch, also account for setup, alignment, payment reconciliation, and the effort for your team. Also check that the payment methods and processes you need are reliably supported.

Finally, every agreed detail belongs in writing: price components, prerequisites, validity, review dates, and payout terms. A friendly “yes” in the room doesn’t replace a clear agreement.

Which questions belong on your negotiation checklist? 

Take these into the conversation:

• Which cost components are passed through, and which do you bill yourselves?
• What do my total costs look like for my current transaction mix?
• What fees apply on payment attempts, refunds, and chargebacks?
• Which terms are possible at the volume I’ve reached?
• What conditions apply to lower tiers?
• How are reserves calculated, released, and reassessed?
• When are payouts actually available?
• What minimum fees, terms, and notice periods apply?
• Can we put the agreed changes fully in writing?

You don’t have to memorize every fee item. You should understand how your contract works and which terms match your business.

Compaytence supports online merchants with questions around payment processing, PSP setup, and held funds. For your own review, the work starts with a manageable task: lay the contract and the statement side by side, mark open items, and add the right numbers.

That’s how you walk into your next conversation with concrete questions.