2 Best APIs for Billing/invoicing in Nigeria

Stripe is the world's leading developer-first payment infrastructure platform, offering a comprehensive suite of APIs for accepting payments, managing subscriptions, running marketplaces, issuing cards, and managing financial operations across 195+ countries. Stripe processes hundreds of billions of dollars annually for millions of businesses globally and is widely regarded as setting the gold standard for payment API design, documentation quality, and developer experience. CRITICAL NOTE FOR NIGERIAN BUSINESSES: Stripe does not currently support merchant account registration for Nigeria-incorporated businesses, NGN settlement to Nigerian bank accounts, or local Nigerian payment methods (bank transfers, USSD, Verve cards). Nigerian businesses cannot register a Stripe account as a Nigerian entity. Nigerian businesses needing local payment processing should use CBN-licensed alternatives: Paystack (Stripe subsidiary, Nigeria-optimized), Flutterwave, Monnify, Kora, or other Nigerian-licensed payment processors. However, Stripe remains highly relevant to the Nigerian tech ecosystem in several important capacities. Paystack — Nigeria's leading payment gateway and most developer-loved fintech API — was acquired by Stripe in 2020 and has adopted many of Stripe's API design conventions. Nigerian developers who learn Stripe's patterns (idempotency keys, webhook signature verification, payment intent lifecycle, connect architecture) will find this knowledge directly transferable when building on Paystack or other modern payment APIs. Diaspora and cross-border cases: Nigerian-founded companies incorporated in the United States, United Kingdom, or other Stripe-supported markets can register Stripe accounts under those foreign entities and use Stripe to charge international customers. This is a common path for Nigerian SaaS founders who incorporate in Delaware (for US market access or investor requirements) and use Stripe to charge global subscribers. The Nigerian individual may build and operate the product, but the contracting entity is foreign-incorporated. Stripe Connect is Stripe's marketplace and platform payment architecture, allowing a platform business to facilitate payments between buyers and sellers or service providers with automatic split payment, commission deduction, and payout management. For Nigerian developers building marketplace products intended for international markets — freelance platforms, services marketplaces, SaaS reseller programs — Stripe Connect provides the payment infrastructure to handle multi-party money flows between international participants. Stripe Billing handles subscription management, recurring payment scheduling, proration for mid-cycle plan changes, invoice generation, retry logic for failed payments, and metered billing for usage-based pricing. For SaaS products serving international markets, Stripe Billing reduces subscription payment infrastructure development from months to days while handling edge cases like payment method expiration, card declines, and dunning flows automatically. Stripe Radar is an AI-powered fraud detection system that scores every payment request in real time and can automatically block suspicious transactions based on customizable rules. For platforms handling international transactions that include potentially high-fraud regions or payment patterns, Radar provides machine learning-based fraud prevention without building custom fraud detection infrastructure. Stripe's documentation is widely considered the best in the payments industry — comprehensive, accurate, with full API reference, extensive guides for common integration patterns, and code examples in multiple languages. Nigerian developers studying payment API design use Stripe documentation as a reference model for understanding best practices in API design, error handling, webhook architecture, and payment security that apply across any payment provider.