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#2 Stripe
Developer‑friendly payment platform with extensive APIs, support for subscriptions, marketplace payouts, and global card acceptance.
Full‑service solution that lets merchants accept credit cards directly on their site while leveraging PayPal’s buyer protection.
#4 Braintree
A PayPal company offering seamless integration, recurring billing, and support for multiple payment methods including Apple Pay and Google Pay.
Long‑standing gateway with fraud detection, recurring billing, and easy integration for small‑ to mid‑size businesses.
#6 Adyen
Enterprise‑grade platform that unifies online, in‑app, and in‑store payments with advanced risk management and global acquiring.
Global payment processor offering omnichannel solutions, competitive interchange rates, and robust reporting tools.
Built‑in payment gateway for Shopify stores, handling credit‑card processing with automatic payouts and no third‑party fees.
#9 Payline Data
All‑in‑one payment gateway with transparent pricing, recurring billing, and a focus on high‑risk merchant support.
#10 Helcim
Transparent, subscription‑based processor offering integrated POS, e‑commerce, and robust reporting for SMBs.
#11 PaySimple
Payment and billing platform geared toward service‑based businesses, featuring recurring invoicing and automated reminders.
#12 Clover
Versatile POS and payment system with a range of hardware options, app marketplace, and integrated online checkout.
#13 PayJunction
Secure gateway focused on high‑volume merchants, offering tokenization, recurring billing, and detailed analytics.
#14 CyberSource
Visa‑owned solution delivering advanced fraud management, tokenization, and global acquiring for enterprise merchants.
#15 WePay
Platform for marketplaces and platforms, providing embedded payments, risk monitoring, and instant onboarding.
#16 Amazon Pay
Leverages Amazon shopper accounts for checkout, offering familiar UI, fraud protection, and seamless integration for e‑commerce sites.
Global payment gateway supporting multiple currencies, recurring billing, and a suite of compliance tools.
#18 Payoneer
Cross‑border payment network ideal for freelancers and marketplaces, offering card‑linked payouts and mass payments.
#19 Razorpay
India‑focused payment gateway with instant settlement, subscription billing, and extensive SDKs for developers.
#20 PayU
Emerging market payment processor supporting credit cards, digital wallets, and installment plans across LATAM, Europe, and Asia.
If you like Square’s ecosystem but need a pure API, the Square Payments API offers direct card processing without the full Square Online suite.