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SS billing helps. But I've noticed my DE clients seem to change their cards a lot more often than my bank account clients. The DE people are apparently more vulnerable to ID theft fir some reason. At least I hear about it more from them as to why their draft didn't go through after they forgot to call me or the company with their new card info. Seems like I have to babysit my DE clients nearly as much as my debit clients!There's also true SS billing. Don't oversell and make sure the company gets their money before the client can beat them to the bank!