Payfy vs. a Payment Function: Rent Rules or Write One?
One payment-customization Function beats Payfy for stable gating rules: about a day of dev work (Deploi estimate, illustrative) retires a permanent subscription. Hide, reorder, or rename payment methods by cart total, country, or tag, with logic you version and test. Payfy earns its fee with zero dev bench, or when rules change weekly and marketing needs a self-serve UI. Scripts died June 30, 2026; both lanes now run on Functions.
Your profile — see how the verdict shifts
- Confidence
- High — The parent payment-method-gating verdict already scored this lane: the Function is a day of bounded work against a permanent fee, and the boundary (bench, rule churn) is structural. Payfy tiers unverified (illustrative)
- Reference scenario
- $20M–$100M GMV · 2–6 stable gating rules · agency dev bench
- As of
- August 2026
Decision at a Glance
| Your profile | Verdict | Why |
|---|---|---|
| Zero dev bench | BUY | An app is the only lane that ships without a developer; the monthly fee is the price of having no bench, and it's a small one. |
| Agency bench · 2–6 stable rules | BUILD | A day of Function work retires the subscription forever (Deploi estimate, illustrative); stable rules never justify rent. |
| In-house devs · evolving rule set | BUILD | Rules-as-code with tests and metafield-driven thresholds make each new rule an edit, not a tier upgrade. |
| Weekly rule churn · marketing self-serve | BUY | A condition UI non-devs can drive beats redeploying a Function every promo; keep the app where rule churn is the actual workload. |
What Payfy: Payment Rules vs. a single payment-customization Function Actually Drives
| Outcome | Impact | How it works |
|---|---|---|
| Revenue — direct | High | The right payment methods in the right order lift completion: surfacing the method a shopper expects, and burying mismatches, removes friction at the decision moment. |
| Operational efficiency | High | Gating COD or invoice terms by geography and cart profile prevents the failed-collection and chargeback cleanup that mis-offered methods create. |
| Customer experience | Medium | Shoppers see only methods that work for their cart and country, which reads as a checkout that understands them. |
| Data & insight | Low | Rules-as-code carry history: every gating change is a commit with an author and a reason, auditable at compliance time. |
Spend ceiling: Gating logic is worth a day of dev work or a small subscription, nothing more: cap spend at the smallest thing that expresses your rules, roughly $1,000–$3,000 one-time (Deploi estimate, illustrative).
What buying enables (top apps)
- + Live gating in an hour with no deploy pipeline
- + A condition UI marketing can drive during promo weeks
- + Vendor-maintained coverage as Shopify's payment APIs evolve
What building additionally unlocks
- + Rules-as-code: versioned, reviewed, unit-tested gating logic
- + Zero recurring fee for logic that rarely changes
- + Rule combinations no condition builder anticipates, straight from the API
- + No third party touching the payment surface at all
Find Your Verdict in 3 Questions
Do you have any dev capacity — agency or in-house?
Yes: Go to question 2.
No: Your verdict: BUY — Payfy is the honest zero-bench lane; keep the rule list documented as a future Function spec.
Do gating rules change more than about once a month?
Yes: Your verdict: BUY — a config UI beats a deploy pipeline for high-churn rules; re-check when the promo calendar calms down.
No: Go to question 3.
Are the rules expressible from cart, customer, and market inputs?
Yes: Your verdict: BUILD — one payment-customization Function, about a day of work (Deploi estimate, illustrative), retires the subscription.
No: Your verdict: CUSTOMIZE — build the Function for core gating and keep an app only for the exotic condition it can't reach.
The TCC Scorecard — 12 Dimensions
TCC — Total Cost of Capability: what it actually costs to have this capability over three years, whichever way you get it. Each dimension is scored 0–5 for both paths. How we score →
| Dimension | Buy | Build | Why |
|---|---|---|---|
| Cost | |||
| Acquisition & implementation | Payfy configures in an hour; the Function is about a day of dev work plus review and deploy (Deploi estimate, illustrative). | ||
| Recurring fees | The app bills monthly forever for logic that rarely changes (illustrative); the Function's recurring cost rounds to zero. | ||
| Maintenance & upgrades | The vendor absorbs API version cycles; a deployed Function needs a version bump roughly every 6 months, minutes of work when rules are stable (July 2026 research). | ||
| Switching & exit | App rule configs rebuild by hand at exit, though the rule list doubles as the spec; the Function's code and tests stay in your repo. | ||
| Risk | |||
| Vendor risk | A small utility vendor in a crowded checkout-rules category; the Function's only dependency is Shopify's own Functions runtime. | ||
| Security & compliance surface | The app touches checkout config through sanctioned APIs; the Function adds no third party to the payment surface at all. | ||
| Platform-deprecation exposure | Both lanes run on Functions, the surface that replaced Scripts on June 30, 2026; first-party code tracks it with a compile, not a vendor roadmap (July 2026 research). | ||
| Value | |||
| Fit to requirement | Payfy's condition builder covers common gating well; a Function expresses any rule the API exposes, including combinations no builder anticipates. | ||
| Time to market | An hour versus about a day (Deploi estimate, illustrative); neither lane blocks a launch. | ||
| Performance & scale | Both execute server-side at checkout speed; the Function carries zero third-party config lookups and nothing extra to slow down. | ||
| Data ownership & AI-readiness | Gating logic in a vendor UI is knowledge you rent; rules-as-code sit in your repo, reviewed, versioned, and testable. | ||
| Focus & opportunity cost | The app saves a day of bench time; the Function is small enough that the opportunity-cost argument barely applies. A classic first Functions build. | ||
The App Landscape
| App | Status | Pricing | Best for |
|---|---|---|---|
| Payfy: Payment Rules | Live — Best-known dedicated payment-rules name in the category | Monthly tiers | Zero-bench teams and weekly-changing rules |
| BeSure Checkout Rules | Live — Bundles payment and shipping rules in one builder | Monthly tiers | Payment and shipping rules under one config UI |
| A single payment-customization Function | Build lane — First-party surface: one small Function in your own app, about a day of work (Deploi estimate, illustrative) | ≈1 dev-day one-time (Deploi estimate, illustrative) | Stable gating logic you version, test, and never rent |
The Build Path
- One payment-customization Function: A small Function hides, reorders, or renames payment methods from cart, customer, and market inputs; the whole rule set lives in one reviewed file.
- Config via metafields: Thresholds and country lists read from shop metafields, so routine tweaks are a data edit, not a redeploy.
- Tests as the safety net: Unit tests pin every rule; checkout logic gets the same review bar as any revenue-critical code.
- Effort band
- About one dev-day, an estimated $1,000–$3,000 all-in with review and deploy (Deploi estimate, illustrative); sits below the $10–25K contact-form band and often bundles into a wider checkout engagement
- Typical timeline
- 1–3 days including tests and deploy (Deploi estimate, illustrative)
- Maintenance, honestly
- ~15–20% of build cost per year in practice (Deploi estimate), often under $500/yr (Deploi estimate, illustrative): an API version bump roughly every 6 months and rule edits as markets change.
- What you own — and what you take on
- You own: the rule set, its tests, and its history. You take on: keeping one Function compiling through Shopify's version cycles, which is minutes per cycle for stable rules.
3-Year Total Cost of Capability
| Buy (app path) | Build (custom path) | |
|---|---|---|
| Year 0 (setup) | $0–$200 (setup) | $1,000–$3,000 |
| Years 1–3 (recurring) | $360–$3,600 (subscription) | $0–$1,500 (version bumps) |
| 3-year total | ≈$360–$3,800 | ≈$1,000–$4,500 |
- † All figures illustrative samples for the reference scenario — not quotes, not verified pricing.
- † Payfy column: mid-tier subscription held flat.
- † Build column: one Function with metafield config; three-year horizon.
What the Sticker Price Hides
On the buy path
- — Tier boundaries key on features and store count, so one extra rule type can mean the next tier (illustrative)
- — A small utility vendor sits between you and your payment methods: pricing, packaging, or support can change under you
- — Rule logic lives in a vendor UI, so nobody reviews it like code and audits happen by screenshot
On the build path
- — A Function nobody documents becomes invisible infrastructure; put the rule list in the repo README
- — API version bumps land roughly every 6 months; two skipped cycles turn the bump into a small project (July 2026 research)
- — Rule churn is the real cost: weekly-changing gating turns every tweak into a deploy, which is Payfy's honest lane
What Merchants Say
Scripts-deadline anxiety dominated the migration window: teams that gated payment methods with Scripts hunted for the smallest possible replacement, and a one-day Function is usually it.
The app-side complaint shape: a checkout-rules subscription running for years to hold three conditions nobody has touched since setup.
If You Change Your Mind Later
If you bought and outgrow it
Export means transcription: screenshot every Payfy rule, then hand the list to a developer as the Function spec, about a day of work (Deploi estimate, illustrative). Uninstall only after the Function ships, because gating gaps at checkout show up instantly as payment-method chaos.
If you built and want out
Nothing is stranded: the Function's rule set is readable code, so retreating to an app is a config afternoon. Deleting the Function restores default payment behavior immediately, which makes rollback the cheapest in this hub.
When This Answer Changes
We're watching for:
- ▸ Shopify expanding native payment-method controls in admin settings, which would shrink both lanes
- ▸ Payfy pricing or packaging changes (illustrative bands here; re-verify quarterly)
- ▸ Rule churn rising past roughly monthly edits — the point where a config UI starts beating redeploys
Verdict change log:
No changes since first publication (August 2026).
Common Questions
Can Shopify hide payment methods without an app?
Shopify hides, reorders, and renames payment methods through payment-customization Functions, the first-party surface that replaced Scripts on June 30, 2026. Admin settings alone don't express conditional rules like hide COD above $500 (illustrative). The logic needs either a small custom Function, about a day of dev work (Deploi estimate, illustrative), or a rules app like Payfy driving the same API.
When is Payfy the right choice over a custom Function?
Payfy wins in two situations: no dev bench exists, or gating rules change weekly and marketing needs a self-serve UI instead of a deploy pipeline. A condition builder beats code for high-churn promo rules across 10+ markets (illustrative scenario). For 2–6 stable rules with any dev capacity, the one-day Function wins on cost, ownership, and auditability (Deploi estimate, illustrative).
How hard is it to build a payment-customization Function?
A payment-customization Function is one of the smallest builds on Shopify: 1–3 days of dev work including tests and deploy (Deploi estimate, illustrative). The Function reads cart total, country, customer tags, and market, then hides, reorders, or renames payment methods to match your rules. Thresholds live in metafields, so routine edits are data changes, not redeploys. Most agencies bundle it into wider checkout work.
Your Next Steps
If you're going with BUILD(matches your selected profile)
- Write every gating rule as a plain sentence: condition, method, action
- Map each rule to Function inputs: cart total, country, tags, market
- Put thresholds and country lists in metafields for no-deploy edits
- Ship with unit tests per rule; checkout logic earns real review
- Diary the ~6-month API version bump alongside your other Functions
If you're going with BUY
- Configure rules in a sandbox first; payment-method changes hit live checkout instantly
- Document every rule outside the app — the list is your exit spec
- Verify tier boundaries against your store count and rule types
- Re-price the one-day Function at the first quiet quarter
Official Docs & Sources
- About functions in payments — shopify.dev
- Customizing and editing your checkout (checkout extensibility) — Shopify Help Center
Official documentation linked for verification — our verdicts and estimates are our own.
Related Decisions
Should You Build or Buy Payment Method Gating on Shopify?
Payment method gating is a build for any Shopify store with dev capacity: one small Function, about a day of work.
Should You Build or Buy Checkout Customization on Shopify Plus?
Checkout customization on Shopify Plus is a build: own the Functions and extensions, rent only the generic blocks.
Should You Build or Buy Checkout Tracking & Pixels on Shopify?
Customize wins for checkout tracking on Shopify: an Elevar-class app for destinations plus an owned audit and server-side glue layer.
Should You Build or Buy Shipping Rate Logic on Shopify?
Shipping rate logic splits three ways on Shopify: native settings for simple, a Functions build for logic, rules apps for carrier complexity.
Should You Build or Buy Your Shopify Scripts-to-Functions Migration?
A Scripts-to-Functions migration is a build for any store whose checkout logic still earns money — unported rules have already gone silent.
Ready to retire the rules subscription?
We'll transcribe your gating rules into one tested payment-customization Function, usually inside a day, and tell you honestly if your rule churn means Payfy should stay.
Contact us todayVerdict scored for the reference scenario above. Estimates are not quotes; Payfy pricing here is illustrative re-verified quarterly. Full scoring anchors: see the TCC methodology.
Read how we score these decisions (the TCC Framework). No affiliate links, no paid placement — no app vendor pays to appear here.