I believe He's saying that when you give $100 to a meshulach for an organization or something... that the organization is only getting a certain amount also because the meshulach takes his own "fees".
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okay, usually the term"meshulach" is referring to somebody collecting for himself.
In any case, my question still remains - if he is collecting for an organization, if I pay with cc the org will end up getting less than the amount of maser that I owe.
(The fact the org pays him I don't think is my problem. )