square.onLocationCustomAttributeOwnedDeleted subscribes to location.custom_attribute.owned.deleted for the selected seller. It requires MERCHANT_PROFILE_READ.
Example
automations/square-on-location-custom-attribute-owned-deleted.automation.ts
Event
A custom attribute owned by your application was deleted from a location. The signal resolves to the officialSquare.LocationCustomAttributeOwnedDeletedEvent payload with type narrowed to location.custom_attribute.owned.deleted.