Enterprise plan is very transparent - you pay only 0.2% from total order value per each successful order, no hidden costs. Your enterprise fee is calculated and displayed in order summary.
Once order is closed, an invoice with a due date will be issued and uploaded to your Billing menu under Invoices. Your credit card will be charged automatically. You will be informed if your credit card's expiration date is approaching. Failing to update credit card information will lead to your subscription being cancelled.