How to Integrate with Stripe API: A Step-by-Step Guide for Developers

A Stripe API integration enables products to process payments, manage subscriptions, create invoices, issue refunds, and synchronize billing data, making it essential for SaaS companies involved in ecommerce, marketplaces, or subscription services. Successfully integrating with Stripe involves more than handling payment requests; it requires addressing idempotency, retries, pagination, and webhook reliability, especially when using multi-account platforms like Stripe Connect. The guide outlines the direct integration process with Stripe's REST API, highlighting the need for understanding authentication with API keys, using idempotent requests, and managing core resources such as customers, PaymentIntents, and subscriptions. It also discusses the operational complexities of maintaining a Stripe integration, such as handling payment state machines and subscription lifecycle management. Additionally, the guide introduces Unified's Payment and Accounting APIs as an alternative to simplify integration, offering normalized billing objects and abstracted webhook handling, ideal for products supporting multiple billing systems. For robust integrations, designing around PaymentIntents, webhooks, and idempotency from the start is crucial, and choosing between direct integration or a normalized layer depends on the specific needs and complexity of the product's billing operations.