Payments for Med Spas: What Stripe, Square, and the Big Processors Actually Cost You

Your tickets are weird: $300 for a facial, $600 for Botox, $800 for a laser session, $2,400 for a package series, $299 a month for a membership. Stripe, Square, Adyen, Chase, Fiserv, Global Payments, and Worldpay priced for coffee shops. What their published rates cost you at real med-spa ticket sizes — and the workflows their generic pages ignore: package prepayment, no-show fees, memberships on card-on-file, and financing that doesn't eat the margin. Rates checked October 2026. Also see Med Spas, AI for Med Spas, and Tech for Med Spas.

The fee table: what each processor actually charges you

Square (Free plan): 2.6%+$0.15 in-person, 3.3%+$0.30 online, 3.5%+$0.15 stored/keyed. Stripe: 2.7%+$0.05 in-person, 2.9%+$0.30 online, 3.4%+$0.30 card-on-file. Clover (Fiserv): 2.3–2.6%+$0.10 in-person, 3.5%+$0.10 keyed/online. Interchange-plus = 0.3% markup estimates.

$300 facial (in-person): Square $7.95 · Stripe $8.15 · Interchange-plus ~$6.15

$600 Botox (in-person): Square $15.75 · Stripe $16.25 · Interchange-plus ~$12.25

$800 laser session (card on file): Square $28.15 · Stripe $27.50 · Interchange-plus ~$16.35

$2,400 package series (card on file): Square $84.15 · Stripe $81.90 · Interchange-plus ~$48.35 · ACH (0.8%, capped at $5) $5.00

$299/month membership (stored card): Square $10.62 · Stripe $10.47 · Interchange-plus ~$6.20

$84 versus $5 — same $2,400 package. At volume: $50,000/month in card revenue = $600,000/year. Square: ~$16,500/year. Interchange-plus: ~$12,600/year. Difference: ~$3,900/year — and that's before the stored-card surcharge on your packages and memberships, where the real gap lives. Every processor rides on payments infrastructure — companies like Finix build the rails moving card money from your clients' banks to yours.

The row your statement hides: BNPL at the point of sale. Afterpay through Square costs 6%+$0.30 on every plan — $144.30 on the $2,400 package. Stripe's Klarna/Afterpay runs 5.99%+$0.30. Financing sells packages, but price it like the margin item it is.

The workflow checklist the big processors fail

Where med spas actually lose money:

• Deposits on every booking. 20–50% on laser and injectable blocks, card on file on everything else. Stripe/Square hand you a generic payment link — no deposit-versus-balance tied to the appointment type.
• No-show fees with teeth. $75–$150 on a two-hour laser block, charged to the card on file with signed consent. The fee nobody charges is a suggestion, not a policy.
• Packages paid up front. The $2,400 series is collected at the consult, tracked as six redeemable credits. Partial payments and per-session billing are how packages evaporate.
• Memberships on stored cards. $299/month auto-billed; Stripe 3.4%+$0.30 and Square 3.5%+$0.15 on every cycle — ~$10.50/month per member vs ~$6.20 on interchange-plus. At 100 members that's ~$5,000/year in stored-card surcharge alone.
• Financing, priced honestly. CareCredit's 2026 AmSpa member rates: 6-month 4.22%, 12-month 7.42%, 18-month 10.30%, 24-month 11.40% — on $2,400 that's $101.28 to $273.60. Non-recourse, paid in two business days. Cherry, PatientFi, and Sunbit fill the same role with their own merchant fees — compare them per term, not per brochure.
• HSA/FSA: mostly no. Cosmetic services are generally not HSA/FSA-eligible — don't market them that way. (Medically necessary treatments with a Letter of Medical Necessity are the exception; that's the client's paperwork, not yours.)
• ACH on big packages. $5 flat on $2,400 vs $84 stored-card on Square. “Card today, or bank transfer and keep the $79” — frame it as her savings. Settles in 3–5 days.
• Chargeback exposure. “I didn't like my filler” is a chargeback reason in the real world. Before/after photos, signed consent forms, and treatment notes are your dispute armor — and Square charges no chargeback fee, a genuine plus in a dispute-prone vertical.

Flat-rate vs. interchange-plus: the break-even at med-spa tickets

Med spas are where flat-rate looks most reasonable and costs the most: your revenue concentrates in stored-card packages and memberships, exactly where flat-rate's stored-card penalty (3.4–3.5%) bites hardest. At 0.3% markup, interchange-plus beats Square on every ticket size — $6.15 vs $7.95 on the facial, $48.35 vs $84.15 on the package.

The membership math is the clincher: 100 members x $299/month x 12 = $358,800/year in recurring revenue. Square stored-card: ~$12,600/year. Interchange-plus: ~$7,400/year. The ~$5,200/year gap is a new laser handpiece every few years, paid to your processor.

When flat-rate is fine: a solo injector under $15,000/month doing mostly in-person single sessions — the gap is ~$1,500/year, not worth the merchant-account paperwork. When it's not: any spa selling packages and memberships, which is to say, any spa with a growth plan. Adyen, Chase, Fiserv, Global Payments, Worldpay: quote-based, zero med-spa guidance. Interchange-plus in writing or walk away.

The honest verdict on each processor

• Square: fine for a solo injector under $15k/month. The 3.5% stored-card rate taxes every package and membership you sell; Afterpay at 6%+$0.30 is the most expensive financing on this page. No chargeback fees is a genuine plus.
• Stripe: great online booking payments; for a med spa it's a developer tool — no deposit logic, no package credits, no membership dunning out of the box.
• Clover/Fiserv: fine countertop hardware, wrong pricing model — 3.5%+$0.10 on the stored-card revenue you live on.
• Adyen: enterprise; not a med-spa product.
• Chase, Global Payments, Worldpay: quote-based, bank-led, zero med-spa guidance. Negotiate hard or skip.
• Platform-integrated payments (Zenoti, Boulevard): convenient, Square-priced. The package-credit tracking and membership billing integration is worth real money — fine for year one.
• Interchange-plus via an independent ISO: the grown-up answer once packages and memberships are the business.

ClaroPro pairs bilingual voice-to-invoice with payments — the package invoice and payment link leave the treatment room before the client does.

How a med spa actually wires this up: notes from Finix's public docs

Finix's public docs at docs.finix.com are the blueprint for deposits, packages, and memberships:

Card on file — tokenization. Every booking takes a card; you never store the number. Finix's Tokenization Forms embed a PCI-compliant form — the card number lives only inside Finix's iframe, your server gets a token starting with “TK” and creates a Payment Instrument on the client's Identity via POST /payment_instruments. No-show fees, deposits, and membership cycles all charge the stored instrument. Account Updater refreshes reissued cards — your $299 memberships don't die to expired cards.

Deposits without a developer. Payment Links you text the client — no integration — and Invoices with partial payments. The 50% deposit on the $2,400 laser package: half now, balance at session one.

Authorize now, capture at the appointment. POST /authorizations holds the no-show fee amount at booking — reserved, not taken. Client shows: POST /authorizations/{id}/void and charge the visit normally. No-show: POST /authorizations/{id}/captures for the fee. No charge-and-refund — refunds cost you the original fee on most processors.

Webhooks close the loop. Finix fires an event on every settlement and failure, so package credits decrement and membership status updates without anyone checking a dashboard.

The catch: Finix is infrastructure: dashboard tools work with no code; API flows need a developer. Test at finix.sandbox-payments-api.com first. You don't open a Finix account the way you open Square — its rails reach you through a provider built on top, the same way your laser runs on power you didn't generate.

FAQ

Cheapest way to take a $2,400 package payment? ACH bank transfer — about $5 flat. You wait 3–5 days. Worth $79 of waiting.

CareCredit, Cherry, PatientFi, or Sunbit? Compare per term, not per brochure. CareCredit's 2026 AmSpa member rates (4.22%–11.40% by term) are the benchmark; the others compete on approval rates and their own merchant fees. All are non-recourse — that's the point.

Can clients use HSA/FSA for Botox? Generally no — cosmetic services aren't eligible. Don't market it that way; the client with a Letter of Medical Necessity is the exception.

Should I offer Afterpay? It sells packages — at 6%+$0.30 through Square ($144.30 on $2,400). Price it as a margin item: offer it, but steer big packages to ACH or CareCredit first.

How do I enforce no-show fees without drama? Card on file at booking, signed policy at intake, fee charged automatically with a polite text. The drama comes from surprise, not from the fee — disclose it three times before it ever fires.

Will switching processors interrupt bookings? Not with a one-week overlap. Stored cards need re-tokenization — migrate memberships and package balances deliberately, then cancel the old account.

The processor decision is worth roughly $4,000–$6,000 a year; the workflow decision (deposits on every booking, packages paid up front, memberships that auto-bill) is worth more. Collect the package before the client leaves the treatment room — AI for Med Spas shows the voice-to-paid package sale. Once a year, run this fee table against your last 12 months of statements. Re-check these numbers yearly.