What a WhatsApp proxy is and how it works
A WhatsApp proxy is an intermediary IP that sits between your device, emulator, or automation tool and WhatsApp's servers. Instead of WhatsApp seeing the IP of your office or server, it sees the proxy's address, which can be a residential, mobile, or datacentre IP located in a country you choose.
WhatsApp checks registrations and logins in its own ways, and a proxy does not change those checks. If you do use one for your own business line, pick an IP in the same country as the number, so a UK number connects from a UK IP rather than a cloud server in another region. That keeps things simple; it is not a way around WhatsApp's verification.
Proxies handle traffic over HTTPS or SOCKS5. SOCKS5 is often preferred for WhatsApp because it passes the underlying socket without rewriting it, which suits the app's persistent connection model. Budget Proxies supports HTTP, HTTPS, and SOCKS5 with either username-password or IP-whitelist authentication.