# Protocol Overview

- [SDK and Request Node Overview](/advanced/protocol-overview/request-client-and-request-node.md)
- [Payment Networks](/advanced/protocol-overview/how-payment-networks-work.md): Rules for how a payment should be processed and detected
- [Private Requests using Encryption](/advanced/protocol-overview/private-requests-using-encryption.md)
- [Smart Contracts Overview](/advanced/protocol-overview/contracts.md)