Is your payment service provider holding your business back?

But is it?

Something can be functioning without being optimised. A payment service provider (PSP) can go on processing transactions reliably behind the scenes every single day, while at the same time holding your business back in ways that rarely show up in any benchmarks or reports.

It’s an easy trap to fall into. Payment performance is usually reviewed by finance or operations teams, who naturally focus on cost per transaction and system uptime. Those metrics matter, of course, but they only tell part of the story. The other part, the one that shapes revenue and customer trust, tends to exist outside the reports most teams focus on.

But you can see it in the customers who abandon checkout because

• Their preferred payment method wasn’t available.
• Or in the transactions declined by an overly cautious risk engine.
• Or the months lost while waiting for a market rollout that a modern payment stack could support in weeks.

Legacy payment infrastructure creates these hidden commercial limitations. And they rarely trigger an alert.

This is particularly common across DACH retail, where merchants often maintain long-standing PSP relationships that were never built for today’s cross-border, omnichannel businesses. 

This article looks at what a genuinely optimised PSP does differently, and why it’s worth treating payment infrastructure as a growth lever rather than merely a technical box to tick.

A PSP can hit every uptime target and still create friction elsewhere in the customer journey. Reliability and performance are different things, and the gap between them is what most merchants often miss.

Uptime is easy to monitor, so it becomes the metric teams tend to focus on. A payment system that’s available around the clock feels like a problem that’s already been solved, and attention naturally moves elsewhere. But availability only confirms that the system is accepting requests. It says nothing about whether those requests are converting into completed sales, or whether the experience behind them matches what customers now expect.

• Take acceptance rates, for example. A payment can be declined more often than necessary, simply because the PSP’s risk rules are calibrated too conservatively for the customer base. Every unnecessary decline is a lost sale, and most merchants never see the scale of it because it doesn’t register as an outage.
• Conversion works much the same way. If a customer’s preferred payment method isn’t available at checkout, they will rarely wait around. They’ll just switch to a competitor or abandon the cart entirely. A PSP that’s slow to add new payment methods, or that can’t support the ones your target markets actually use, caps your conversion rate before anyone notices there’s a problem.
• Then there’s expansion. Entering a new market often means new regulations, new local payment preferences, and new compliance requirements. A legacy PSP can turn a straightforward rollout into a months-long project, simply because the infrastructure wasn’t built to flex.
• Limited reporting compounds all of it. Without granular insight into acceptance, decline reasons, and payment mix, it’s difficult to know where performance is falling short. You can only act on what you can measure. And many PSPs still can’t provide all the data merchants need to do that.

If a merchant expands from one core market into three neighbouring ones, their existing payment service provider handles the transaction volume without issue, so nothing looks broken from the outside. But local shoppers in the new markets don’t recognise the payment methods on offer, acceptance rates dip below what the merchant sees at home, and the reporting doesn’t break performance down by market clearly enough to show why. The PSP is working exactly as it always has. It simply wasn’t built for what the business is trying to do next.

The hidden cost of legacy infrastructure

The cost of an outdated payment stack is spread across operations, customer experience, and growth, which is exactly why it’s so easy to overlook.

Operationally, legacy systems tend to demand more manual work: reconciliation, exception handling, and workarounds for features the platform wasn’t designed to support. Those overheads add up, and they scale in the wrong direction, growing more cumbersome as order volume increases, rather than becoming faster and more efficient.

• Customer expectations have also changed. Shoppers now expect seamless checkout, familiar local payment methods, and instant confirmation as standard. A payment stack that can’t keep pace sows doubt at precisely the moment a customer needs to feel confident.
• Scalability is another blind spot. What works at a modest order volume can buckle under growth, particularly across borders, where payment preferences and regulatory requirements vary significantly. Merchants often discover these limitations once they’ve already committed to a new market, when the cost of switching is at its highest.
• Legacy infrastructure also slows innovation. New payment methods, embedded finance features, and improved checkout experiences all take longer to implement on outdated systems. Competitors running on more modern infrastructure can move quicker, and capture the customers you’re still working to convert.

This kind of cost builds gradually: a slightly lower conversion rate here, a slightly longer implementation timeline there, until the cumulative effect becomes hard to ignore. By the time it’s visible in reports and on the bottom line, it’s usually been affecting performance for years. 

Payments are more than transactions

It’s tempting to think of payments as plumbing: a pipeline that moves money from customer to merchant, and back again when something is returned. The best PSPs do considerably more. They shape the entire commercial relationship between a brand and its customers: at checkout, after it, and at every payment touchpoint in between.

• Conversion is the clearest example of this. A checkout that feels smooth, trustworthy, and familiar converts people who are just browsing into committed buyers. Every additional payment method offered, every second removed from the checkout flow, and every unnecessary decline avoided has a direct, measurable impact on revenue.
• Customer experience follows the same logic. Payment failures, confusing error messages, and slow refunds erode trust, often at the exact moment a brand most needs to earn it. A well-designed payment experience reinforces confidence instead.
• Acceptance rates affect growth directly. Higher acceptance means more completed sales from the traffic you’re already driving. Better reporting gives commercial teams the insight they need to make faster, more confident decisions about where to invest, and the data to justify those decisions at board level. 

The commercial case is concrete. Merchants who add Riverty’s Buy Now, Pay Later (BNPL) solutions via the Adyen platform have seen conversion increase by up to 15%, average order value (AOV) rise by up to 16%, and consumer retention improve by up to 20%. These are gains that come from better payment infrastructure.

Across enterprise retail, this shift is already underway. Payments leaders who once reported purely on uptime are increasingly being asked to explain their impact on conversion and retention, using the same commercial language used everywhere else in the business. Merchants who treat their payment stack as a strategic asset now are best placed to compound that advantage as volume grows.