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  • Individual User:
    • Format: [phoneNumber]@c.us
    • Description: This is the most common format for sending messages to individual WhatsApp users. You need to use the user’s full international phone number. Crucially, omit any leading + symbol or other special characters like spaces or hyphens. After the numeric phone number, append @c.us.
    • Example: If a user’s phone number is +1 (213) 213-2131, the corresponding chatId would be [email protected].
  • Hidden User ID (LID):
    • Format: [someNumber]@lid
    • Description: The LID (Linked ID) is an alternative, privacy-preserving identifier for a WhatsApp user. Every WhatsApp user has both a standard phone number-based ID (@c.us) and a hidden LID. LIDs are often used in contexts where exposing the actual phone number is not desirable or necessary. The [someNumber] part is a unique numeric string associated with the user’s LID.