Yes. You have granular control over who can spend how much per order or individual item. Simply set a maximum per-order and per-product price for each user in their user type.
Yes, for some of our customers we offer the possibility to cancel the order up to 10 minutes after receipt of the order. You will then find this directly in the order.
If you have any questions, please contact us via the blue communication box at the bottom right of the screen.