Facebook offers the WhatsApp Business API through its Business Manager platform.

1. Visit Facebook for Developers:
   Go to the Facebook for Developers website at developers.facebook.com.
2. Log In:
   If you already have a personal Facebook account, you can sign in using your credentials.
   If you don’t have a personal account, you may need to create one first.
   
3. Create a Business Profile:
   Set up your business profile with relevant information, including a profile picture, business description, and other details.
4. Phone Number Verification:
   Verify your business phone number to ensure that it can receive SMS or phone calls
5. Create a New App:
   Click on “Create App” or a similar button to start the app creation process.
   
6. Select App Type:
   Choose the “For Everything Else” or a relevant category that fits your business needs.
   
   Select the app type of  ” Business “.
   
7. Complete App Setup:
   Provide the necessary details for your app, such as the app name, contact email, and select business account.
8. Create App ID and Secret:
   After setting up the app, you’ll receive an App ID and App Secret. Keep these credentials secure.
   
9. Add WhatsApp Business API Product:
   In the app dashboard, navigate to the “Add a Product” section.
   Find and select the “WhatsApp” product.
   After this click on “Start using the API”.  Here you get the “Temporary access token”, ” Phone number ID ” and ” WhatsApp Business Account ID ”  which are used to Authenticate the plugin as the mention below image.