Phone Number ID

When you register a phone number with the WhatsApp Business API, Meta assigns it a Phone Number ID, a numeric string that serves as the primary identifier in API requests. You use this ID (not the actual phone number) when sending messages, managing templates, and configuring webhooks. This abstraction layer provides security by keeping your actual phone number out of API calls and logs. Each phone number can only be associated with one WABA at a time. You can find your Phone Number ID in the Meta Developer Portal under your WhatsApp Business app settings or by calling the phone numbers endpoint of the Graph API.