Bridging the Vendor–Bank Chasm in Payments Modernization 

Key takeaways:

• Banks are navigating rising complexity. Legacy architectures and accumulated custom code slow modernization and increase operational strain.
• Vendors are evolving, but challenges remain. Even strong platforms require careful integration, change management, and domain expertise to deliver full value.
• Market movement is accelerating. Many banks are exploring new approaches and architectures as they look for simpler, more modular, future-ready payments capabilities.

The vendor–bank chasm is widening 

Every bank is different. Customer expectations, regional regulations, product mix, risk appetite, and brand promise all shape how payments should work. Yet many vendors sell standardized platforms optimized for scale and repeatability. The mismatch forces banks into heavy customization just to make the technology fit their operating reality. 

At first, those tweaks can seem harmless: a workflow change here, a reporting requirement there. But over time, incremental customizations accumulate into a complex and opaque environment, one that’s expensive to change and hard to fully understand. As teams move on and institutional knowledge fades, documentation falls behind. The result is a fragile ecosystem where even “minor” upgrades feel risky, because no one can confidently predict what downstream processes might break. 

In that environment, stability becomes the default strategy. Teams avoid change, not because change isn’t needed, but because the cost of unintended consequences such as outages, failed releases, and customer impact feels too high. Ironically, the very customization intended to make platforms fit better can leave banks stuck with solutions they don’t like and can’t easily leave.  

This challenge is compounded by what older, legacy payment engines often deliver: multiple siloed systems across rails (ACH, wires, cards, instant), duplicated technology and teams, and bolt-on monitoring that limits a unified, data-driven view of risk and performance. 

Why banks are looking for a different way

It’s no surprise, then, that many banks are rethinking vendor relationships. In our latest survey of 300 senior payment professionals, a large majority say they’re considering switching their primary payments platform vendor. A meaningful portion expect to move in the near term, some within two years, others within five. The drivers are straightforward: aging legacy stacks, rising customer expectations, and intensifying regulatory pressure. When platforms are too rigid, too expensive to maintain, and too slow to evolve, modernization stops being optional. 

What banks want instead is a clearer path to modernization that doesn’t require years of bespoke rework. Increasingly, vendors have responed with service-based target architectures: modular components, well-defined interfaces, and interoperability across systems. In simple terms, banks are trying to reduce the amount of “special” code they carry, so they can upgrade more safely, integrate new capabilities faster, and avoid rebuilding the same custom features repeatedly. Modern platforms are therefore often positioned as the bridge—consolidating capabilities into a hub across rails and making scheme connectivity and scaling more configuration-led than rebuild-led. 

A modular approach also shifts the long-term economics. Simplified stacks generally mean fewer dependencies, fewer breakages during upgrades, and lower effort to adopt new services. It’s a move toward resilience and flexibility, not just modernization for modernization’s sake. 

Ultimately, modernization is not just a technology upgrade, but a data, integration, and operating-model challenge. It requires banks to seek platforms with real-time visibility and safer interoperability, and vendors to move beyond standardized releases toward modular, bank-specific architectures so both sides can better reduce complexity over time. 

Anecdotally, banks are spending over 80% of their payments modernization budget on keeping pace with regulatory change.  

The frustrations banks voice most loudly 

When banks describe what bothers them about vendors, a few themes dominate. 

High maintenance costs are a top complaint. Customization doesn’t just add features—it adds surface area that must be tested, supported, and revalidated every time something changes. Mid-sized banks feel this acutely; many report maintenance as their biggest frustration. 

Lack of flexibility is another leading issue: the platform simply doesn’t do what the bank needs without significant workarounds. This becomes especially painful for the largest institutions, where complexity and scale amplify every limitation. 

Cost overruns and slow delivery round out the core frustrations. Projects run long for familiar reasons: unclear scoping, limited expertise and testing challenges. When timelines slip, the consequences ripple into compliance commitments and operational risk. 

Beyond the top categories, banks cite additional pain points like communication challenges, code quality concerns, excessive customization burden, unclear alignment on requirements, rigid roadmaps, and weak documentation. None of these issues are catastrophic on their own. Together, they create a climate where every new change feels heavier than it should. 

One telling signal: many banks say they spend a substantial share of time managing customizations, often more than a fifth of their capacity. Smaller banks report spending even more. That is time not spent improving customer experience, strengthening controls, or building new products. 

Integrations are an often-overlooked driver of cost and delay in payments modernization. Even after a platform is selected, banks still need to connect it to a wider ecosystem such as digital channels, fraud/AML tooling, core banking, reconciliation, reporting, and data platforms. These integrations can be disproportionately complex where interfaces aren’t standardized, documentation is weak, or historic customization has created rigid dependencies. In many cases, the platform is only part of the challenge—the “last mile” of enterprise integration, data mapping, and end-to-end testing across dozens of downstream systems is where complexity compounds. 

Change management is equally critical, whether implementing a new platform or rolling out version upgrades. Benefits only land when teams adopt new processes and controls, supported by clear ownership, training, communications, and disciplined cutovers. Delivery also depends on having the right mix of payments SMEs and technical skills (e.g., architecture, integration, testing, release management). Vendors may know their product deeply, but they rarely understand each bank’s unique legacy stack well enough to own transformation end-to-end, so banks often end up coordinating the majority of migration and cutover complexity. Where that capability is missing, institutions often experience rework and slower timelines. 

Satisfaction is high; but loyalty is fragile 

Here’s the twist: despite the frustration, banks often rate vendor satisfaction highly—on average, well above the midpoint. On paper, vendors are doing “fine.” 

But satisfaction isn’t the same as security. High scores can coexist with active switching intent when the relationship feels strategically limiting. Banks can be satisfied with a vendor’s people, support, or stability while still believing the platform is no longer the right foundation for the next decade. 

That creates a paradox for vendors: current customers may sound happy, yet still be planning an exit. Meanwhile, competitors see an opening because the market is unusually fluid. In other words, vendor satisfaction can be an opportunity and a threat at the same time. 

What happens next

The next few years will likely be decisive. Banks are signaling that they want platforms that evolve with them—without dragging a tail of costly bespoke code and upgrade anxiety behind them. Vendors that respond by enabling modular architectures, reducing forced upgrades, improving domain depth, and making change safer will strengthen their position. Those that rely on satisfaction scores alone may find that comfort is temporary. 

In payments modernization, the biggest risk isn’t just outdated technology. It’s the widening space between standardized vendor platforms and the real complexity of how banks operate. 

If you need help with your payments platform modernization, or you’re curious how our Applied AI can help to make your project run smoother, speak to one of our experts.