If after entering the confirmation code when connecting WhatsApp Cloud API, the number remains in "Awaiting Confirmation" status, you need to send a POST request to Postman to confirm the number.

You need this:

• The confirmation code that was received on the number when the account was created;
• Access token generated under the system user with administrator rights on business.facebook.com;
• Phone number id from the API Settings section of the created application on developers.facebook.com.

1. Open Postman, create a new POST request, and in the request line enter: https://graph.facebook.com/v20.0/phonenumberid/register, where the phonenumberid is the id of the number to be connected.
   
2. Go to "Autorization" - "Auth Type", select "Meta API" - "Bearer token", in the "Bearer token" field specify the access token generated under the system user with administrator rights.
   
3. In "Body" select "raw", in the input field insert the code, where 000000 is the 6-digit confirmation code received to the number when creating the account.
    {
    "messaging_product": "whatsapp",
  "pin": "000000"
 }
4. Click "Send" to forward the request.
   
   If all data are filled in correctly - the status 200 OK will be returned.
   
5. The status of the number on Facebook will change to "Connected".