Automated Payment → Access → CRM Flow (Tilda + PayPal + Make)

I built an end-to-end automation for a paid online course using Tilda, PayPal, and Make. The system processes payment webhooks, validates purchased products, prevents duplicate transactions, assigns users to the correct access groups, updates a Google Sheets CRM, and sends automated emails with course access details. The flow is resilient to repeated webhooks and platform limitations, fully eliminating manual work and ensuring reliable access delivery for paying customers.