I am wondering is the below is possible and if it is relatively easy to do:
I have a form that creates customer invoices. If the invoice is more than 1 day old and someone wants to change the prices on the invoices, I would like them to have to enter a "password". That "password" that would allow them to change the price field would be the form ID number times 2 (or some similar formula). They wouldn't know this formula... it would only be known for me.
In the end... if one of my works wants to change the price field of a form that is older than one day old, they would have to email me the reason. In order for me to give them the "password" I would simply multiply the ID# times two and that would give them access.
Is this something that is possible? How hard is it to do?