"Losing Part Of The Mitzvah?"
Akiva commenting on 39¢:
Your post related a question I've been wondering about, perhaps someone here knows...
In the mitzvah of meiser sheni, we transfer the kedusah of the meiser to a coin. Just as trumah is holy and can only be eaten by the kohein, no substitutions allowed, meiser is as well, though substitution is allowed.
Substitution, however, involves a physical object. If I empty and count my tzedakah box and substitute a check, which I then send to the charity organization, seems straightforward.
But if I do the same thing and then go to the charity's web site, use my credit card and make an online payment in the amount, the charity has certainly received the value but there is no physical object involved in the transfer, no substituted physical object that moves from my possession to the possession of the charity in conveying the value.
While ASJ makes a nice chinuch point about using a checkbook, with older children they can see me go to the web site and understand (somewhat) credit card value. But by having eliminated the physical substitution, are we breaking the physical custody chain and thereby actually losing part of the mitzvah?