Payment processing APIs

Payment Processing APIs and Platforms

Payment processing platforms provide financial infrastructure, billing, and global transaction capabilities for businesses ranging from creators to enterprise corporations. These tools manage everything from standard e-commerce checkouts and B2B trade credit to SaaS subscription billing and automated tax compliance.

Core Payment Processing and Infrastructure

Stripe operates as a global financial infrastructure platform that processed $1.9T in payments volume in 2025 [2]. The service handles 500M+ API requests per day, maintains a rate of 10K+ API requests per second, and upholds a 99.999% historical uptime [2]. Stripe supports 135+ currencies and payment methods globally [2]. Balance serves B2B commerce by automating payments, invoicing, and trade credit, allowing sellers to offer net terms up to net 90 days with AI credit risk management and end-to-end automation [3]. Balance supports payment methods including same-day ACH, wire, credit cards, and global payments [3].

Subscriptions, SaaS, and Creator Commerce

Recharge Payments powers 71% of subscriptions sold on Shopify stores, serves over 20,000 brands, and processes over $1B per month with a customer satisfaction rate of 95%+ [4]. Recharge users experience an 11% higher subscriber conversion and a 3x increase in shopper lifetime value (LTV) through features like predictive analytics, churn prevention, loyalty rewards, and AI-powered Concierge SMS [4]. Paddle functions as a Merchant of Record platform managing payments, global taxes, compliance, and billing across 300+ markets for 10,000+ customers [6]. Paddle processed 190 million transactions, remitted $130 million in sales taxes last year, and includes ProfitWell Metrics for tracking alongside Retain for recovering failed payments [6]. Lemon Squeezy provides an all-in-one platform for software companies to handle recurring billing with weekly, monthly, or yearly options, free trials, discounts, global tax compliance, VAT, fraud prevention, and automatic software license key management [7]. Gumroad allows creators to sell digital products, subscriptions, and video lessons worldwide, with digital entrepreneurs earning $2,024,855 last week on the platform [1]. Examples of creator success on Gumroad include Max Ulichney earning more than his 6-figure CG salary within 2 years selling Procreate brushes, Steph Smith making $10k+ per month selling informational products, and Daniel Vassallo receiving direct bank payouts every Friday [1].

What is not covered

Specific technical documentation for API integration endpoints, detailed fee structures or pricing tiers for each platform, and security compliance certifications beyond basic uptime and fraud prevention are not included.