To set up your parent Business Manager, you need to determine which Business Manager will be your designated parent Business Manager.
This parent Business Manager:
The parent Business Manager is responsible for paying for any child Business Manager activity. Contact your Facebook representative and open a line of credit (LOC) within that Business Manager if one doesn’t already exist. The LOC will display as a payment method in Business Manager.
If your parent Business Manager doesn’t have a LOC, we won’t have a way to pay for your child Business Managers ad activity.
Once you have a credit line set up in Business Manager, you need to mark that as shareable so that your child Business Managers can access it.
System users represent servers or software making API calls to assets owned or managed by a Business Manager.
If an Admin system user does not already exist, create one on the parent Business Manager to programmatically manage assets and ads:
business_managementpermissions. Store it for later use.
Granting the Finance Editor role to the system user allows the system user to share the proper payment method to the child BM:
Learn more about Business Manager System User and About Your Business Settings in Business Manager, Ads Help Center to create a system user in the Business Manager tool.