Zettle by PayPal is a cloud-based point-of-sale platform (formerly iZettle) providing REST APIs for managing product inventory, processing card payments, tracking purchases, handling refunds, and accessing merchant financial and account data.
- Developer Portal: https://developer.zettle.com/
- API Overview: https://developer.zettle.com/docs/api
- GitHub: https://github.com/izettle
- Status Page: https://status.zettle.com/
- Pricing: https://www.zettle.com/gb/pricing