Campaign ID

To get your Campaign ID:

Go to Ads Manager.
Click the Columns dropdown menu and then choose Customize Columns.
Under the Settings header, select Object Names & IDs.
Click to check the box next to Campaign ID.
Check the box next to Save as preset and give your preset a name, this is optional. The next time you click the Columns dropdown, you can choose that preset to see the ID numbers for your campaigns.
Select Apply. You should now see your campaign, ad set or ad ID in the Ads Manager table.

Please find below a reference to REST API documentation
https://developers.facebook.com/docs/marketing-api/reference

Updated on: 20/07/2022