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The process of downgrading WhatsApp Business API number is different from deleting WhatsApp/WhatsApp Business App.
1. Go to your Facebook Business Manager
Open Business Settings & choose WhatsApp Accounts from the left panel.
2. Select your WhatsApp Business API account
If you have multiple WhatsApp Business API accounts, select the one you want to downgrade.
3. Go to 'Settings' & scroll down & click on 'WhatsApp Manager'
4. Click on 'Account Tools' & choose 'Phone Numbers'
5. Click the trash bucket icon to downgrade your WhatsApp Business API Account
After downgrading, wait for a few minutes & log in to your WhatsApp/WhatsApp Business App.
Note: Downgrading your WhatsApp Business Account is now a Reversible process. You can re-create a WhatsApp Business API account using the same phone number. But, you'll permanently lose all data including messages, contacts & more stored in the WhatsApp Business API account.
If you want to downgrade your number from WhatsApp/WhatsApp Business app & switch to WhatsApp Business API, follow the same steps in reverse via the WhatsApp Manager.
