People are wise to be wary of providing their information to an unknown entity. OTOH, I am persuaded that OP has developed software to perform check-in. A pure scammer wouldn't bother with Daylight Saving Time. What I see is one more case of "Wouldn't this be a cool thing to automate?" without wondering why it doesn't already exist.

This is example of what you might call Chesterton's Non-Fence. If you come across a place where a fence should be but it's not there, ask yourself why it's not there before you build one.