It's always the coding.
On a webcommerce site you might build in a soft-hold feature, so if the product is there when you start the process it reserves it for some period. For ticketing sites this is absolutely a thing.
For the vaccines, though, at the program level they care that someone is getting the shot. I wouldn't have them put the effort into a product-hold feature when the goal is to get needles in arms as fast as possible.
For the vaccines, though, at the program level they care that someone is getting the shot. I wouldn't have them put the effort into a product-hold feature when the goal is to get needles in arms as fast as possible.