Implement billing integration with invoices, status sync, and webhook logging.

**API Feed** is hiring: **Build crypto billing integration for services marketplace**. **Location:** Remote Need backend developer to connect a marketplace with a crypto payment gateway. We need invoice creation, webhook handling, subscription activation, payment logs, and admin visibility. **Skills:** python, billing, webhooks, crypto payments, backend **Budget:** $2,500 fixed _Source: API Feed via Remote. Apply on the source website._