I have flyers that describe both of these. JUST IN CASE you're receiving no cards because there is no money in your account. Do keep in mind that QSL bureaus are human too. This happened to me once. Meanwhile, I coughed up the cash from my personal checking account, figuring it was I that had lost the money.
Sorters are very nice persons in general.
Treat yours nice, and you'll get good service. Return to the library file section.