What is the Billing link in the CRM?
Billing is a link to the billing page of your Housing Market account. It is in the account menu, in Settings and on the Plan and billing screen, and it opens in the same tab.
Billing appears in three places: in the account menu, in Settings and on the Plan and billing screen beside Manage billing. Choose it and the CRM takes you, in the same tab and signed in as you, to the billing page of your Housing Market account.
It is an addition. Plan and billing, Manage billing and everything you used before are where they were. See "How do I upgrade, add users or cancel?" for the steps there.
If the billing page cannot be opened, the CRM shows "This part is being updated." and you stay where you are. Nothing is changed, charged or cancelled by that.