If you have already started running ads, Facebook will send you an invoice to inform you about what and how much you need to pay.
Here is a guide on how to find your Facebook Invoices:
1. Go to Facebook Business Manager
2. In the top left-hand menu, click on Billing.
3. You will be directed to the Billing Pane where you will be able to view all of your invoices and their respective details. From there, you can Download your invoices.
While in the Business Manager, you can search your invoices by Invoice Number, Ad Account ID, Bill To, or Advertiser, giving you a variety of specific search options.
If you are still having a hard time searching for your invoices, do not hesitate to send us a message.