Researched and Edited by Rajat Gupta
Last updated: · How we review
Editor's Summary · Payment Processing Software
Klarna dominates by volume with 154,488 ratings at 4.1/5, driven by global scale across consumer-facing checkout flows and buy-now-pay-later installment options, priced on quotation for merchant accounts. Balance draws strong satisfaction at 4.5/5 across 20,705 ratings and is particularly used by B2B marketplaces needing net terms, invoicing, and credit workflows built directly into the checkout experience. Opayo scores 4.7/5 across 4,139 ratings on a subscription model and is a consistent pick for UK-based merchants that need PCI-compliant card processing with predictable monthly costs.
Payment processing software handles the end-to-end movement of funds between buyers and sellers, covering authorization, settlement, fraud screening, and reconciliation across card, digital wallet, and ACH payment methods. Core buyers are e-commerce operators, marketplace platforms, and finance teams at mid-market companies managing multi-currency or cross-border transactions with complex settlement requirements.
Quick picks for Payment Processing Software
- Best overall — Klarna
- Best for B2B marketplaces with net terms — Balance
- Best for UK merchants on subscription pricing — Opayo
Who gets the most from Payment Processing Software
- 1Finance managers at subscription-based service companies evaluating secure and scalable payment solutions
- 2Payment operations leads at e-commerce platforms needing multi-channel payment acceptance and integration
- 3Sales directors at retail businesses seeking versatile payment methods including mobile and POS terminals
How to choose Payment Processing Software
If you prioritize security and scalability, filter by products with strong encryption and high availability features. For businesses requiring multi-channel payment acceptance, sort by those supporting diverse payment types like mobile, POS, and online. When transparency is key, filter by Free Trial or publicly available pricing, though most top products use quotation-based pricing.
Showing 21-40 out of 52

PayJunction
Streamline payments with secure, 24/7 support.
Best for: SMB teams · Mid-market · Enterprise
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What is PayJunction?
PayJunction is a modern, enterprise-class, multi-channel payment processing software. It comes in a SaaS (Software as a Service) model for subscription-based revenue streams and with an easy to install on-premise version for single processors or mini-merchant banks. PayJunction is secure, ...
Read more about PayJunctionPayJunction offers custom pricing plan

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What is PaymentSpring?
PaymentSpring is a leading provider of Payments Solutions that enable merchants to accept credit & debit payments with ease. With its robust Feature-Rich Software, industry-applicable Support, competitive Pricing and a promising Growth Strategy, this secure payment processor offers an ultimate ...
Read more about PaymentSpringPaymentSpring offers custom pricing plan

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What is Square Payments?
Square Payments is a mobile and in-person payment processing solution used by small business owners — independent retailers, food vendors, and service providers — to accept card payments via smartphone or tablet without dedicated point-of-sale hardware. It combines a free card reader, simple ...
Read more about Square PaymentsSquare Payments offers custom pricing plan

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Afterpay
Split your payments, expand your possibilities.
Best for: SMB teams · Mid-market · Enterprise
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What is Afterpay?
Afterpay enables customers to acquire what they need and want, while simultaneously building strong financial wellbeing and managing their expenses, by splitting the payments up over four installments, for online and in-store purchases. This innovative solution is dedicated to granting our ...
Read more about AfterpayAfterpay offers custom pricing plan

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What is Zip?
Zip's platform allows merchants to enjoy increased conversion rates, stabilized customer loyalty, and no-delay payments. It's simple to set up without API integration required, offering compatible solutions with WooCommerce, Shopify, BigCommerce, and more. Experience complimentary, ...
Read more about ZipZip offers custom pricing plan

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What is Balance?
Balance is a B2B payment processing platform used by online merchants and marketplaces to support net terms, milestone-based billing, and flexible payment options at checkout — capabilities that standard consumer payment processors do not handle natively. It solves the problem of business ...
Read more about BalanceBalance offers custom pricing plan

Privacy
Protect your finances with secure virtual cards.
Best for: SMB teams · Mid-market · Enterprise
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What is Privacy?
Protect your finances and personal information with Privacy.com. Keep your real card info safe by creating separate virtual cards per payment, setting custom settings for each card for increased security. Get exactly what you need in no time with 1-click virtual card creation. Effortlessly take ...
Read more about PrivacyStarts from $10/Month, also offers free forever plan

Przelewy24
Effortless payment processing for modern businesses.
Best for: SMB teams · Mid-market · Enterprise
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What is Przelewy24?
Przelewy24 is a multichannel payment processing software with a single, unified platform. It gives you the ability to present modern payment techniques to your customers, and provides all the tools to support online channels. We simplify the way you process transactions and provide 24/7 ...
Read more about Przelewy24Przelewy24 offers custom pricing plan

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What is Stripe Payments?
Stripe Payments is the most powerful and flexible way to accept payments on the web. It is a simple way to accept credit cards on your website, in your mobile app, or wherever payments are made. In addition to accepting payments online, Stripe provides you with all the tools you need to ...
Read more about Stripe PaymentsStripe Payments offers custom pricing plan

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What is Payline Data?
Payline Data is an integrated interchange-plus payment processing software that offers a proven payment solution that can scale from start-up to small and mid-sized businesses to large corporate enterprises. The intuitive interface improves tracking and managing of your payment processing ...
Read more about Payline DataPayline Data offers custom pricing plan

Sezzle
Empowering budget-friendly purchases, hassle-free.
Best for: SMB teams · Mid-market · Enterprise
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What is Sezzle?
Sezzle is an accredited B Corp that simplifies the payment process for buyers with budget plans and finance options with absolutely no fees or interest! Customers can easily integrate Sezzle with renowned platforms, like Shopify Plus, WooCommerce and more, to improve sales and gain new ...
Read more about SezzleSezzle offers custom pricing plan

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What is MagicPay?
A complete online payment processing and marketing platform, MagicPay is everything you need to start and run a successful business immediately. Our secure, robust payment gateway technology enables merchants to set up online shop fronts and accept all major credit cards, cryptocurrencies and ...
Read more about MagicPayMagicPay offers custom pricing plan

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What is Affirm?
Affirm is a revolutionary financial service employing advanced technology to create disruption in the industry. We put customers first by offering financing solutions that are simple, straightforward and free of hidden charges. Our Affirm for Merchants program arms business owners with the ...
Read more about AffirmAffirm offers custom pricing plan

What is LEVELSET?
Levelset provides contractors and suppliers with cloud-based tools to manage payments and take the stress out of the process. With Levelset, users can exchange necessary payment documents like lien waivers, pay applications, and preliminary notices to have a clear understanding of everyone ...
Read more about LEVELSET
Heartland Payment Processing
Efficient payment processing for your business.
Best for: SMB teams · Mid-market
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What is Heartland Payment Processing?
Heartland Payment Processing software was designed with convenience in mind. A "point of sale payment processing" system, it offers the ability to run a business without having to purchase bulky expensive equipment or hire a pricey staff. The software's date and time stamp can record customer ...
Read more about Heartland Payment ProcessingHeartland Payment Processing offers custom pricing plan

Merchant One
Efficient, secure payment processing for any business.
Best for: SMB teams · Mid-market · Enterprise
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What is Merchant One?
Merchant One Payment Processing Software is the easiest cloud-based solution on the market today. Merchant One fuses together the ease of a POS system with powerful processing and shopping cart functionality. It is one payment processing software allows you to quickly and easily setup and ...
Read more about Merchant OneMerchant One offers custom pricing plan

Fattmerchant
Revolutionize your business transactions with Fattmerchant.
Best for: SMB teams · Mid-market · Enterprise
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What is Fattmerchant?
Fattmerchant, now branded as Stax, is a payment processing platform for small and mid-sized US businesses that charges a flat monthly subscription plus interchange cost rather than a per-transaction markup, which lowers effective rates for businesses processing higher payment volumes. It ...
Read more about FattmerchantStarts from $49/Month

Libeo
Streamline your invoices, simplify your cash flow.
Best for: SMB teams · Mid-market · Enterprise
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What is Libeo?
Libeo is the go-to solution for businesses looking to streamline their invoice and payment processes. As Europe's leading B2B payments platform, Libeo offers convenience and efficiency with its centralized platform. Say goodbye to tedious and error-prone manual processing, as Libeo digitizes ...
Read more about LibeoLibeo offers custom pricing plan
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What is SwipeSimple?
SwipeSimple is a software platform designed to make digital payments for small businesses effortless and efficient. With built-in customization tools, merchants can quickly adjust tax rates, add items to the cart, and connect peripheral devices via USB to get going. With SwipeSimple's fully ...
Read more about SwipeSimpleSwipeSimple offers custom pricing plan

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What is Laybuy?
Laybuy lets you get the purchases you want now and pay in six instalments with no interest! No more waiting - this stress-free payment plan is a great option for those that want to shop and pay later. Unlike buy now, pay later services, you'll get full protection from consumer laws with Laybuy, ...
Read more about LaybuyLaybuy offers custom pricing plan
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