企業可設定專屬用戶名稱，且企業電話號碼仍會顯示於 WhatsApp 或 WhatsApp Business 介面。每個企業用戶名稱僅能對應單一 WhatsApp 電話號碼，不同號碼不得使用相同用戶名稱。
企業用戶名需遵從一下格式要求：
may only contain english letters (a-z), digits (0-9), period (.) and underscore (_) characters
must be between 3-35 characters in length
must contain at least one English letter (a-z, A-Z)
must not start or end with a period or have 2 consecutive periods
must not start with www
must not end with a domain (e.g., .com, .org, .net, .int, .edu, .gov, .mil, .us, .in, .html, etc.)
case is ignored when comparing usernames, but period and underscore characters are not; for example, myID and myid are the same *username but myid, my.id and my_id are all distinct
