If you ever need to Access your Extra Credits Purchases History/Invoices, you will be able to access these not in the Surfe Dashboard but in the Surfe App > top left corner of your screen > Invoice History.
You can buy more credits for the whole account (not individual users) by clicking on this link ⬅️
Your Surfe Subscription's Billings
You can access all invoices in the Surfe Dashboard under the Billing section (admin-only access).