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This is a 2 part issue. First is this, if someone does not pay for the first subscription invoice, let’s say on the first of the month, once the period comes around again and they did not pay they do not get a second invoice for the new period. Thus the I, the user is stuck not getting paid the second time around.
The second issue is the subscription invoice scheduled for the 1st wasn’t paid until let’s say the 17th then the subscription starts from that day not the 1st which can seriously throw off bookkeeping.