Find Your Business ID in Business Manager
Go to Business Settings.
2. Your ID can be seen at the end of the URL in your Business Settings page.
Click Business Info. Below Business Manager Info, you'll see your ID number.
Find your Ad Account ID (Account Dropdown Menu)
Go to Ads Manager.
2. Click the account dropdown menu above the search and filter bar. You should now see the ID number for your ad account.
Find your Facebook Page ID
Click your Page name to go to your Page.
Click "About" in the left column. If you don't see About in the left column, click See More.
Scroll down to find your Page ID below More Info.