Parts 1 through 3 covered the people, the forces, and the front end of the process. The last stretch is where buyers get hurt most and where the work pays off: how deep to push on references, what promise is worth against the contract, who runs the conversion, and how to read the advisor you brought in to keep you safe.

References: Of Course They Picked Their Happiest Customers

Asking a vendor for references and treating the answer as evidence is like asking a job applicant to grade their own interview. Every vendor hands you the same three carefully selected accounts — their happiest implementations. Those calls tell you what is possible when everything goes right, not what is typical when an implementation hits the normal friction. So go deeper than the list: ask for the complete client roster and pick your own references the vendor did not nominate, ideally including one that left. Use the small-world reality — bankers talk, and a botched conversion is known across the peer network quickly — plus independent review sites and your own conference network. On every call, ask the question the curated reference is not prepped for: not "are you satisfied," but "walk me through what went wrong and how they handled it." How deep? Until you have heard one bad story and the vendor's response to it. If every reference is flawless, you have re-interviewed the fan club.

Two steps take diligence past the phone or a Teams/Zoom meeting. The first is the site visit, and it becomes a priority once you are down to one or two finalists, especially for a high-stakes, hard-to-reverse conversion like a core or digital where the cost of ownership is in the millions. A reference call tells you what someone remembers; a site visit lets you watch the system run in production at an institution like yours, see the screens your staff will actually use, and ask questions to the operations people the curated reference was coached past. Make the trip when the decision is consequential and the field is narrow; skip it while you are still comparing many. And keep your team together — the same "divide and conquer" move that shows up on vendor-run visits works just as well at a reference site.

The second is meeting the people you will actually live with. The salesperson disappears at signing; the support organization, the implementation lead, and the account-management team that owns the relationship do not. Ask to meet them before you sign and push on who will own your service tickets and your escalations process for the length of the contract, not the sales engineer brought in to impress. How they answer "what happens when something breaks after hours" tells you more about the next several years than anything in the demo.

Verbal Promises and the Only Document That Counts

This is the easiest place to prevent the most damage. During the sale you will hear encouraging things — "that is on the roadmap," "we can make that work," "support will be all over it." The reality: the person across the table usually has no authority to promise any of it, and even when they sincerely believe it, the law does not care. Under the parol evidence rule, once you sign a fully integrated contract, prior verbal assurances that add to or contradict the written terms are not enforceable, and nearly every vendor contract carries a merger clause built to erase everything said before signing. As Samuel Goldwyn supposedly put it, a verbal contract is not worth the paper it is written on.

So, if it matters, it goes into the contract — every commitment that influenced your decision, with remedies if it is missed. The big print giveth and the small print taketh away, and the small print does its taking in three places: dependence on third-party solutions the vendor does not control, support pricing that escalates after the discounted first term, and a headline price that is rarely etched in stone. The razor is cheap; the blades are the business. Term length is itself negotiable, and shorter favors the bank: a core contract commonly runs five to ten years, but seasoned negotiators urge institutions to never sign past seven and to push renewals toward three to five, because a long lock-in is the vendor's interest, not yours. Your single best moment of leverage is the moment before you sign. It does not come back.

Conversion: The Vendor's Half, and Yours

Signing is the starting line, not the finish, and the conversion is where the risk actually lives. The odds are humbling — McKinsey found that only about 30% of core banking transformations complete a full migration to the new system. They rarely fail on the technology. They fail on the work the bank assumed the vendor would do.

Be clear about the division of labor. The vendor will train your team on its product, configure the system, and make sure you understand how it works; the vendor's project manager runs the vendor's side of the plan — its deliverables, its milestones, its resources. What the vendor will not do is redesign your workflows, rewrite your procedures, deliver the detailed, role-by-role training your end users need, or carry your staff through the change. That half is yours, and no one owns it unless you assign someone. Staff two project managers (primary and secondary), not one, and write two plans: the common and costly mistake is assuming the vendor's PM is running your project — they are running theirs. The bank needs its own project manager, its own change-management and process-redesign plan, and its own owner for end-user readiness, which is exactly where the in-house technology resource from Part 1 earns its keep. McKinsey's transformation research is consistent on this point: clear ownership and well-defined roles are among the strongest predictors of success. Technology is only one piece; people and process decide whether the change holds.

Advisor: Conflicted, Aligned, or Weightless

Which brings me to people like me. Hiring an advisor is, on balance, smart — the whole problem in this series is an amateur facing a professional, and a good advisor closes the gap. But "advisor" is not a guarantee of objectivity, and you should interrogate their incentives as hard as the vendor's. It starts with how they are paid. A fixed-fee advisor earns the same whether you buy, renegotiate, or walk away — the alignment you want from someone whose job is to tell you the truth, including that the best deal is no deal. An advisor paid a percentage of the transaction has a stake in the transaction happening and in it being large; the conflict is well documented in M&A advisory, where success-fee advisors face structural pressure to close any deal rather than the right one. That does not make them dishonest; it makes the incentive worth knowing. If your advisor's pay rises with the size of the contract you sign, their paycheck moves opposite your interest in spending less.

None of that makes a percentage fee wrong; it makes it situational. There is a clean case for it: a renewal where you already believe your business terms are as good as they will get and the only lever left is price. Pay a firm a share of what it saves you and the interests line up; they earn only if they cut your cost. But read that arrangement as carefully as you read the vendor's. Fifteen to twenty-five percent of "savings" for doing little more than pushing price is a rich fee for work a competitive renewal does on its own; the incumbent sharpens its pencil the moment it believes you might leave, with or without a savings firm taking a quarter of the difference. Watch the incentive buried in how "savings" is measured, too: because the number usually scales with the length of the deal, these firms have every reason to steer you toward the longest possible term — the very lock-in this series keeps warning against. And a price-only renewal can quietly skip the question regulators most want answered. The 2023 interagency guidance on third-party relationships expects a bank to confirm, across the life of the relationship, that the provider still aligns with the institution's strategy and risk appetite, not merely that the invoice went down. A cheaper contract for a platform that no longer fits your strategy is a discount on the wrong thing.

There is a third structure — the one I walked into giving free advice to that de novo founder: the advisor who charges nothing. You would think free advice is the safest — no conflict, no incentive to push a deal. In practice it is the easiest to ignore, because people use advice more when they have paid for it and discount what is free. The conflicted advisor's fee grows with the deal; the weightless advisor's fee is zero, and weightless advice changes no decisions. As for type, the former vendor seller knows exactly how the sausage is made, which is useful at the table, with a risk of residual loyalty to the side they used to sit on; the independent expert brings a buyer's orientation and breadth across many institutions, with less granular knowledge of any one vendor's playbook. My bias is to want an advisor whose orientation is unmistakably the buyer's, whose fee does not grow with the deal, and who will tell you to keep your incumbent or buy nothing when that is the right answer. An advisor who has never once recommended walking away is not objective. They are just better dressed than the salesperson.

Whatever you conclude about fees and pedigree, the one decision that is not in question is whether to retain a professional at all. You should — and the professional you want is a genuine subject-matter expert. A core or digital agreement is not a document a banker should face alone: it routinely runs close to a hundred pages or more of dense terms, with exhibits and schedules that quietly allocate risk to the processor and away from the bank, while the salesperson assures you it is all "standard and non-negotiable." It is not standard, and most if not all is negotiable — but only to someone who has seen the benchmarks across dozens of these deals. That is what an SME brings: not a legal opinion, but knowledge of what the market actually pays, which concessions are real, and where the traps are buried. The amateur-versus-professional gap this series keeps describing is never wider than across a vendor's master agreement, and it is the cheapest gap in the whole process to close.

The SME, though, is only half the team. Retain an attorney as well and understand the division of labor between them because it mirrors the one inside the vendor. The subject-matter expert negotiates the business terms: price and benchmarks, service levels and remedies, the deconversion and data-return clauses, the renewal and price-protection language. The attorney turns those terms into enforceable contract language and hunts the legal loopholes, the ambiguities, and the silent autorenewals an operator would miss. Neither substitutes for the other — a lawyer who does not know core economics cannot tell you the price is high, and an expert without counsel cannot make a handshake stick. The strongest outcomes come from a coordinated team — commercial counsel, the subject-matter expert, and your own project manager working the same redlines, not a lawyer reviewing in isolation after the terms are set. Put plainly: your expert wins the deal; your attorney makes sure the deal you won is the one in the signature block.

Buy Like a Professional

Diligence and the deal are where the amateur-versus-professional gap is widest. References are the vendor's highlight reel until you build your own list. Verbal promises evaporate at signing; only the contract survives, and its terms — including the length of the lock-in — are negotiable under the one moment of leverage you will ever have. The conversion that follows is yours to run; the vendor trains you on its product, but the workflows, the procedures, and end-user readiness are your half. And whoever you retain, do not face the master agreement alone — pair a subject-matter expert who can negotiate the business terms with an attorney who can make them stick.

Across all four parts, the move is the same: show up to the table as a professional, in a game the seller assumed you would play as an amateur. The gap is widest at the clean-sheet moments — the de novo, the core conversion, the once-a-decade platform decision where the temptation to buy what you already know is strongest and the cost of getting it wrong lasts the longest. Those are exactly the decisions worth treating as professional purchases rather than familiar ones. And worth paying someone to get right.

CCG Catalyst advises community and regional banks, credit unions, fintech companies, and de novo founders on technology strategy, vendor selection, RFP design, and contract negotiation — on a basis aligned with the buyer's outcome, not the size of the deal. If your institution is preparing for a core, digital, payments, or fraud decision, or building one from the ground up, reach out to our team at www.ccgcatalyst.com. For related reading, see our commentary on building a de novo in 2026 and the full library at CCG Insights.

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By: Paul Schaus | Founder & Managing Partner, CCG Catalyst Consulting

Disclaimer: The views expressed in this article represent the perspective of CCG Catalyst Consulting based on our direct experience advising financial institutions. This commentary is intended to stimulate industry discussion and does not constitute legal, accounting, or regulatory advice.