Polar.sh Payment Integration

Overview

Polar.sh is a Merchant of Record (MoR) platform that handles payment processing, tax collection, and billing. This skill covers the full integration flow: product synchronization, checkout sessions, webhook handling, database schema, and sandbox testing.

Architecture

Products DB → Sync Service → Polar API (Products/Variants/Prices)
                                       ↓
Client → Checkout Session → Polar Hosted Flow → Order Created
                                       ↓
Polar → Webhook → Application → Update Payment Status → Fulfillment

Quick Reference