Explore 1 boilerplate in this collection. Find the perfect starting point for your next project.
Scalable and production-ready SaaS starter kit for Next.js, Nuxt, and SvelteKit.
Features:
Polar offers a comprehensive payment processing API with subscription management, webhook systems, and compliance features built for SaaS businesses. Our Polar boilerplates implement the provider's complete API suite—from Payment Intents to subscription schedules—with secure webhook handling and Polar-specific features like tax calculation and dunning management.
Polar boilerplates integrate the provider's latest API version with proper error handling, idempotency keys, and retry logic. They implement Polar-specific webhook signature verification for secure event processing, use Polar's subscription APIs for lifecycle management (trials, upgrades, cancellations), and leverage Polar's compliance features like SCA authentication and tax calculation. The implementation handles Polar's specific payment flows and error scenarios following provider best practices.
Browse our collection of 1 Polar boilerplate to find the perfect starting point for your next SaaS project. Each boilerplate has been carefully reviewed to ensure quality, security, and production-readiness.
Polar boilerplates implement the provider's complete API suite including checkout sessions, subscription lifecycle management, customer portal, webhook event handling, and invoice generation. They use Polar's latest API version with proper error handling, idempotency keys, and retry logic. The integration includes Polar-specific features like payment intents, setup intents, subscription schedules, and tax calculation APIs.
Polar webhooks are verified using the provider's signature validation to prevent spoofing attacks. The boilerplate includes webhook endpoints with proper Polar signature verification, event type filtering, and idempotent event processing to handle duplicate deliveries. Events are processed asynchronously with retry logic, and the implementation handles Polar's specific webhook events like subscription updates, payment failures, and customer changes.
Polar boilerplates include complete subscription lifecycle management using the provider's API: plan creation, subscription initiation, proration handling for upgrades/downgrades, trial period management, and cancellation flows. The implementation handles Polar's specific billing cycles, metered billing (if applicable), and subscription schedules. Database models sync subscription status, billing periods, and feature entitlements in real-time through webhooks.
Polar boilerplates implement the provider's smart retry logic and dunning management. They handle Polar's specific failure scenarios including insufficient funds, expired cards, and authentication failures. The system sends automated email notifications through Polar's webhook events, implements grace periods before downgrading service, and provides customers with update payment method flows using Polar's hosted UI or API.
Polar boilerplates leverage the provider's tax calculation APIs (Stripe Tax, Paddle's automatic tax handling, etc.) for automatic sales tax, VAT, and GST calculations based on customer location. They implement Polar's compliance features including SCA (Strong Customer Authentication) for European payments, PCI DSS compliance through hosted payment pages, and proper invoice generation with tax line items. All card data is handled by Polar, never touching your servers.