We do live shopping and we can have a burst of orders for a short period of time.
PS : I have no issue with implementing the leaky bucket algorithm handling on the Storefront API. In fact I do not have issues with the rate limitation on the storefront api. but vaulting the card I just get Network Errors and really a lot of network errors even the orders are placed from different ips (obvisouly)
UNLESS you guys you have a workaround using stripe to do the vaulting (or spreedly)