When sending messages from the internet to your on-premise SAP ERP or SAP CRM application, a reverse proxy is normally used within your network to protect your enterprise from malicious messages. When using SAP Cloud for Customer, you can use your existing reverse proxy for the SAP Cloud for Customer communication with your on-premise SAP ERP or SAP CRM. Optionally, you can also use the SAP Web Dispatcher as a reverse proxy. If you want to use SAP Web Dispatcher, then the following documents will help you:
How-To Guide for Configuring SAP Web Dispatcher as a Reverse Proxy
YouTube Playlist for SAP Web Dispatcher Configuration
How-To Set Up SAP Web Dispatcher for Two Way SSL Communication between SAP Cloud for Customer and SA...