I’m not sure where in Shulchan Aruch this is. I recently heard a shiur about paying workers. There is a Mitzvah Asei of “b’yomo titein s’charo” and a Lo Sa’asei of “Lo salin”. These go into effect when the work is completed and/or the employee delivers the product. For instance, when a baby sitter leaves, you are mechuyav to pay her before shkia that day. If you pick up a car from a mechanic, you are mechuyav to pay from the time that the car is picked up. If the mechanic delivers the car to you, you would usually be mechuyav to pay when he delivers it. The exception to this is if you had agreed that it would be delivered at a later point and he delivers it earlier. In this case, the chiyuv doesn’t start until the time agreed upon.
I was wondering how this applies to Electronic work. Is sending an email with completed documents considered delivering the product? What if the employer doesn’t open the email until a few days later, does the chiyuv start when the email is sent or received?
What if I upload updated files to a web server, does the chiyuv start as soon as the new files are “live”? When the employer uses the updated site? When the employer benefits from it by someone else using the site?