Payment processors differ less in the percentage on the pricing page than in fixed fees, card mix surcharges, contract terms and who owns the vendor.
This guide ranks twelve providers on what the first ninety days take, what the invoice becomes once your real baskets are priced, how you leave, and whether the product runs without a partner.
Vendors can pay for visibility on this page. It never changes what an entry
says about a product, including the criticism, and we earn nothing when you click through to a
vendor. How that works.
In short
What payment processing software does
Payment processing software lets a business accept card, bank and wallet payments online or in person, route the money to its bank account, and handle refunds, disputes and reporting.
In this order: setup effort, what it really costs, how your data comes back out, whether
you can leave, and who each payment processing tool is built for. One rule sits on top of those tests:
Places 1 to 3 go to challengers, vendors outside the best-known brands in a category, wherever the category has them; the established names follow from place 4 in their ranked order. Why those five, and why there is no
score out of ten, is on the how we work page.
Published per-sale percentage plus fixed fee; no monthly charge; volume pricing on request
—
Solo founders and small teams launching a paid product quickly
Companies that sell to procurement departments on contracts
Country is where the vendor is headquartered or contracts from, which is a
different question from where your data is hosted. Where the two tell different stories, the
entry says so.
Pay-per-transaction processor with no monthly fee or lock-in
Ranked #1 of 12 in Best Payment Processing Software in 2026.
Published pricingEurope
Mollie runs a pay-as-you-go online plan with no monthly fee, and lists rates by card type, SEPA Direct Debit and bank transfer. Payment links, invoicing, checkout and recurring billing are included in that price.
It is a Dutch B.V. licensed as an electronic money institution by the Dutch Central Bank. Expect to negotiate once volume passes the threshold on its pricing page, and compare commercial-card cost against your buyer mix.
What stands out
Pay per transaction
No lock-in
European payment methods
Where it costs you
Commercial cards and non-EEA cards cost clearly more than domestic consumer cards.
Lowest rates need volume pricing from sales, which the page offers above a monthly volume.
Right for
European online shops wanting listed prices, no monthly fee and no lock-in contract.
Wrong for
Merchants who need to settle mainly in US dollars or Asia.
NetherlandsPublished per-transaction fees; volume pricing on request above a monthly threshold
Bank debit collection priced as a small percentage per payment
Ranked #2 of 12 in Best Payment Processing Software in 2026.
Published pricingEurope
The cheapest collections strategy is not chasing faster, it is removing the decision to pay, and GoCardless makes SEPA and Bacs mandates practical without a bank project. For subscription and retainer billing it can cut overdue balances to a rounding error.
It is a payment rail, though. Failures, disputes and customers who refuse a mandate still need a process, which means pairing it with Chaser or Payt rather than replacing them.
What stands out
Direct debit
Recurring billing
Pay by Bank
Where it costs you
Not receivables management: no dunning ladder or dispute queue
Fees rise on international payments and on the tiers with payment recovery
Right for
Recurring B2B or membership billing that can move to direct debit
Wrong for
One-off project invoices to large corporate customers
United KingdomPublished per-transaction fees on three tiers; custom package above a revenue threshold
Card readers and payment links with a flat rate and optional plan
Ranked #3 of 12 in Best Payment Processing Software in 2026.
Published pricingEurope
SumUp offers merchant accounts in 38 countries and the standalone Solo terminal works without a phone, on a built-in SIM with an offline mode, which is why market traders and mobile businesses use it where other readers fail.
Pricing is published per transaction with no monthly fee, 1.69% in person on the UK list, and optional monthly plans lower the rate. Reporting and integrations are minimal by design, and the inventory features are enough for a coffee stand rather than a shop with a catalogue.
What stands out
Card readers
Payment links
Flat rate
Where it costs you
Reporting and integrations are minimal by design
Thin inventory features
Right for
A mobile or market business that needs a reader that just works
Wrong for
A multi-store retailer
United KingdomPublished flat rate on pay-as-you-go; paid tier with 7-day trial; tailored rates at higher volume
Merchant of record that takes tax and chargebacks off software sellers
Ranked #4 of 12 in Best Payment Processing Software in 2026.
Published pricingEurope
The trade is explicit: Paddle becomes the seller, so it files the VAT, handles the invoices and absorbs the chargebacks, and you take a lower net rate for it. For a team of five selling into thirty countries that is cheaper than an accountant.
Once you have finance staff, the same percentage buys you nothing you could not do yourself, and your customer records live inside a relationship you cannot fully control.
What stands out
Merchant of record
SaaS
Tax compliance
Where it costs you
The rate is far above a plain card processing fee
You do not own the merchant relationship with your customer
Right for
Small software sellers who cannot staff international tax compliance
Wrong for
Companies with a finance team and their own VAT registrations
United KingdomPublished per-checkout percentage plus fixed fee; custom pricing at high volume
Developer-first processor with a public standard rate and custom tiers
Ranked #5 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
Stripe states standard pay-as-you-go pricing with no setup, monthly or hidden fees, and custom interchange-plus plans for large volumes. It offers a merchant-of-record product called Managed Payments, plus Radar for fraud screening.
Contracting entities differ by region, with Stripe, LLC in the United States and Stripe Payments Europe, Limited for most of the EEA. Model the add-on products you need before assuming the standard rate is the whole bill.
What stands out
Developer-first
Global
Add-on products
Where it costs you
Billing, tax, fraud and terminal products are priced separately from the standard rate.
UK-issued cards carry a higher rate than standard EEA cards.
Right for
Software teams who want an API-first processor with public rates and global reach.
Wrong for
Shops wanting one flat all-in price including tax handling.
United StatesPublished pay-as-you-go card rates with no setup or monthly fee; interchange-plus on request
Point-of-sale ecosystem whose card rates differ by plan
Ranked #6 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
Square's free tier is the most complete in payments: you can open a business tomorrow with free software, a cheap reader and no contract, then grow into payroll, loyalty and online selling on the same account. Paid plans, from $49 a month per location in the US, add restaurant and retail features such as coursing and a kitchen display app.
Card acceptance is limited to eight countries. The recurring complaint is account stability: freezes triggered by unusual volume are well documented and painful when they happen to a business that depends on daily settlement.
What stands out
Point of sale
Plan-based rates
US-first
Where it costs you
Account freezes on unusual volume are a recurring complaint
Fees add up at higher volume
Right for
A new business that wants to be selling tomorrow
Wrong for
A high-volume retailer optimising card fees
United StatesPublished rates that vary by plan; entry plan has no monthly fee
Single platform with a fixed fee plus a payment-method fee
Ranked #7 of 12 in Best Payment Processing Software in 2026.
Published pricingEurope
Adyen publishes a fixed fee plus a fee per payment method, and many card methods run on interchange++ with a stated markup. It states that there are no setup or monthly fees.
It was founded in Amsterdam in 2006 and lists 28 offices. Products beyond payment methods, such as issuing and risk tools, are priced separately, so ask for a full quote.
What stands out
Unified commerce
Interchange++
Enterprise
Where it costs you
A fixed fee on every transaction weighs on low-value sales.
Other Adyen products are priced separately from payment processing.
Right for
Larger merchants selling across many countries and channels with one integration.
Wrong for
Small shops with low-value baskets and few payment methods.
NetherlandsPublished fixed fee plus a per-method fee; no setup or monthly fee; other products priced separately
Enterprise acquirer with tailored flat-rate or interchange++ pricing
Ranked #8 of 12 in Best Payment Processing Software in 2026.
Pricing on requestEurope
Checkout.com says it prices on business profile and risk category, with either fully flat-rate or interchange++ structures, and no setup or account maintenance fees. It processes for registered charities at no charge in countries where it operates.
The group is headquartered in London, and Checkout Ltd is regulated by the FCA as an electronic money institution. Ask for both pricing structures in writing and compare them on your own card mix.
What stands out
Enterprise
Interchange++
Direct acquiring
Where it costs you
No rate is published, so comparison needs a sales conversation.
Tailored pricing favours businesses with volume to negotiate.
Right for
Mid-size and enterprise merchants who want direct acquiring and negotiated rates.
Wrong for
Small sellers wanting listed prices and instant sign-up.
United KingdomQuoted per organisation; flat-rate or interchange++ structures
PayPal-owned gateway with published US card, ACH and Venmo rates
Ranked #9 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
Braintree's fee page lists US card, ACH and Venmo rates, a chargeback fee, and says custom flat rates or interchange-plus are available to established businesses. The site now reads PayPal Enterprise Payments.
Use is subject to eligibility and approval by PayPal. Venmo is US only, so the published page helps mainly a US seller, and anyone elsewhere should ask for a quote in their own currency.
What stands out
PayPal group
ACH
Venmo
Where it costs you
Cards from outside the United States and non-USD presentment each add a percentage point.
Approval and acceptance of the agreement rest with PayPal.
Right for
US merchants who want cards, ACH, PayPal and Venmo behind one gateway.
Wrong for
Merchants outside the US wanting published local rates.
United StatesPublished US per-transaction rates; custom and interchange-plus pricing for established businesses
Wallet checkout with published business fees and a tiered plan on request
Ranked #10 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
PayPal lists commercial fees on its fee page, with a standard percentage plus a fixed fee, a lower rate for card payments without a PayPal account, and a higher one for buy now pay later.
A tiered rate plan is available only on request. The company gives its address as San Jose, California. Check the separate fees for disputes and currency conversion before modelling costs.
What stands out
Wallet checkout
Buy now pay later
Broad consumer reach
Where it costs you
A fixed fee on every transaction hurts small baskets.
Buy now pay later transactions cost more than standard commercial ones.
Right for
Sellers whose buyers expect a wallet checkout beside card payments at checkout.
Wrong for
Low-margin sellers whose average basket is quite small.
United StatesPublished commercial transaction fees; tiered rate plan on request
Acquirer now part of Global Payments with UK pay-as-you-go online rates
Ranked #11 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
Worldpay's UK ecommerce page offers pay-as-you-go pricing with no monthly commitment and no setup fee, with Essential and Full packages at different card rates.
Global Payments completed its acquisition of Worldpay on 12 January 2026, and worldpay.com about pages now redirect to Global Payments. Read the contract term and the quote before signing, and ask how and when you can leave if volumes or needs change.
What stands out
Acquirer
Global Payments group
Contract terms
Where it costs you
The UK small-business page notes a minimum 18-month contract on online applications.
Pricing differs by region and page, so the quote is the real price.
Right for
Merchants wanting an established acquirer with a pay-as-you-go online option.
Wrong for
Sellers who need exit within weeks of signing.
United StatesPublished pay-as-you-go online rates in the UK; custom quotes for larger volume
Merchant of record for digital products, now owned by Stripe
Ranked #12 of 12 in Best Payment Processing Software in 2026.
Published pricingNorth America
It does one thing cleanly: a checkout, a subscription and the tax handled, with less configuration than any other entry here. The acquisition changes the calculation rather than the product.
Stripe has already said where the investment goes: the team is building Stripe Managed Payments and has promised Lemon Squeezy users a migration route. Keep customer, plan and payment records in a form you can move, and do not build entitlement logic that only exists inside it.
What stands out
Merchant of record
Digital products
Stripe-owned
Where it costs you
Development has moved to Stripe Managed Payments, with a migration promised
Thin on entitlements, contracts and enterprise invoicing
Right for
Solo founders and small teams launching a paid product quickly
Wrong for
Companies that sell to procurement departments on contracts
United StatesPublished per-sale percentage plus fixed fee; no monthly charge; volume pricing on request
Payment processing software lets a business accept card, bank and wallet payments online or in person, route the money to its bank account, and handle refunds, disputes and reporting. The differences that matter are rarely in the feature list, so this is
the order we would work through them.
01
Decide whether you need a published price
11 of the 12 tools here publish what they cost; the other 1 quote per organisation. The ones you can compare without a sales call: Mollie, GoCardless, SumUp, Paddle, Stripe, Square, Adyen, Braintree, PayPal, Worldpay, Lemon Squeezy.
02
Decide how much the jurisdiction matters
These 12 vendors are established in 3 countries across 2 regions (North America 6, Europe 6). That decides whose disclosure law applies to what the vendor holds, wherever the servers are.
What first-90-day setup means for payment processors
Setup is where small processors and large acquirers diverge. Mollie, SumUp and Stripe publish their rates, so you can model costs and go live without a sales call. Checkout.com prices per business profile, and Worldpay's quote sets the real price, so expect underwriting and contract review before the first live payment. Merchant-of-record services such as Paddle add a different task, because they become the seller of record and you must accept their product and customer-support rules.
Count hours for the integration, the risk review, the settlement test and the reconciliation setup, not only the rate you see on a pricing page. A processor that looks cheaper per transaction can cost more in staff time if your finance team must build payout matching, refund handling and dispute evidence workflows from scratch before the first sale.
Ask how long underwriting takes and what documents are needed
Run a live test payment, refund and payout before launch
Confirm who answers customer billing questions
Real price once cards, methods and add-ons are counted
Headline rates rarely survive a real basket. Adyen adds a fixed fee to a method fee, Stripe prices billing and tax products apart from the standard rate, and Mollie charges more for commercial cards and for cards from outside the EEA. PayPal adds a fixed fee and separate dispute and conversion fees, and Braintree adds a percentage point for non-USD presentment.
Take your average basket, card mix and refund rate, then price each candidate on those numbers. A flat percentage looks cheap on large baskets and costly on small ones, while a fixed fee does the opposite. Square shows the same effect between channels, because its online card rate sits above its in-person rate, so a spreadsheet by channel is worth an hour.
Model fees on your real average basket and card mix
List dispute, refund and currency conversion fees
Ask which products are billed separately
Exit: contracts, data and moving cards between providers
Leaving a processor means leaving contracts, stored card data and recurring mandates. Mollie states no lock-in contracts, and Square states no locked-in contracts on its plans, while Worldpay's small-business page notes an 18-month minimum on online applications. Stored cards are tokenised, so ask each provider whether it will export card data to another PCI-compliant processor and what it charges.
For GoCardless, mandates sit with the provider, so ask how they move. Lemon Squeezy shows another exit route, because its merchants are being steered to Stripe Managed Payments. Whatever you choose, keep your own customer and transaction records in your own accounting or CRM system, so that a change of provider never depends on a vendor export arriving on time or in a usable format.
Read the minimum term and termination notice
Ask for a written card-token export process
Check how direct debit mandates would transfer
Independence, ownership and who stands behind the service
Ownership changes what happens to support and pricing. Worldpay became part of Global Payments in January 2026, Lemon Squeezy belongs to Stripe, and Braintree sits inside PayPal's enterprise payments business. Smaller or single-product providers such as Mollie and GoCardless stay narrower, which suits some buyers and limits others, for example GoCardless collects bank debits, not cards.
Independence here is a practical question: who holds your funds, who signs your contract, and what happens when a product line is merged. Name the contracting entity before you sign, and record the licence or register number it holds, since Mollie, GoCardless and Checkout.com each describe different regulated entities in their own legal notices.
Identify the contracting entity and licence holder
Ask about planned product merges or migrations
Confirm which payment methods each provider covers
What goes wrong most often when buying payment processing software
Choosing on the headline percentage and ignoring fixed fees, which dominate on small baskets.
Assuming a published rate applies to commercial cards, foreign cards and currency conversion.
Signing an online application without reading the minimum contract term.
Treating a merchant of record and a plain processor as the same service, although tax and customer billing duties differ.
07
Frequently asked questions
6 answers
What is the best payment processing software in 2026?
Mollie leads our ranking of 12. Mollie lists card, SEPA Direct Debit and bank transfer fees on one page, charges no monthly fee on its online plan and states no lock-in contracts.
Payment links, invoicing and recurring billing sit inside that price. The weak spot is cost: commercial cards and cards from outside the EEA carry noticeably higher rates, and the best rates need volume pricing negotiated with sales.
Which payment processing tools publish their pricing?
11 of the 12, with the pricing model each one publishes:
Mollie: Published per-transaction fees; volume pricing on request above a monthly threshold.
GoCardless: Published per-transaction fees on three tiers; custom package above a revenue threshold.
SumUp: Published flat rate on pay-as-you-go; paid tier with 7-day trial; tailored rates at higher volume.
Paddle: Published per-checkout percentage plus fixed fee; custom pricing at high volume.
Stripe: Published pay-as-you-go card rates with no setup or monthly fee; interchange-plus on request.
Square: Published rates that vary by plan; entry plan has no monthly fee.
Adyen: Published fixed fee plus a per-method fee; no setup or monthly fee; other products priced separately.
Braintree: Published US per-transaction rates; custom and interchange-plus pricing for established businesses.
PayPal: Published commercial transaction fees; tiered rate plan on request.
Worldpay: Published pay-as-you-go online rates in the UK; custom quotes for larger volume.
Lemon Squeezy: Published per-sale percentage plus fixed fee; no monthly charge; volume pricing on request.
The other 1 quote per organisation.
Is there a free payment processing tool?
No. None of the 12 offer a usable free tier.
Where are these payment processing software vendors established?
In 3 countries across 2 regions: North America 6, Europe 6.
Mollie: Netherlands.
GoCardless: United Kingdom.
SumUp: United Kingdom.
Paddle: United Kingdom.
Stripe: United States.
Square: United States.
Adyen: Netherlands.
Checkout.com: United Kingdom.
Braintree: United States.
PayPal: United States.
Worldpay: United States.
Lemon Squeezy: United States.
What should you use instead of Mollie?
GoCardless and SumUp are the next two on this page. GoCardless is for Recurring B2B or membership billing that can move to direct debit; SumUp is for a mobile or market business that needs a reader that just works.
Who should not buy Mollie?
Merchants who need to settle mainly in US dollars or Asia.. Commercial cards and non-EEA cards cost clearly more than domestic consumer cards..
If your payment processing software product belongs among these 12, tell us what it does and who it is for. Inclusion is an editorial call; what a listing is and is not is set out under software advice.
