Phone Number ID

To get your Phone Number ID:

Login to My Apps
Click on the Business App where your WhatsApp number configured
Navigate to WhatsApp > Getting Started from the left menu
In Send and receive messages > Step 1: Select phone numbers > From > Select the phone number from Dropdown menu
Copy the Phone number ID under the Dropdown menu

Please find below a reference to REST API documentation
https://developers.facebook.com/docs/whatsapp/on-premises/reference

Updated on: 22/08/2022