When subscription based services charge you a monthly fee, when do they charge it? First of the month? Same date next month? 30 days from original pay?
For example if I pay for a subscription on the 1st and someone else pays on the 15th, when will my subscription end, and when will I be charged again? Same question for the person who pays on the 15th.
Most services charge me on the same monthly day on which I made my first payment. If its something like pay per use, sometimes they charge bimonthly or so. To my experience both customers and providers prefer this schedule.
It depends, but many services tend to bill on a single day each month and pro-rate new sign-ups based on the remaining days.
There are several advantages to paying on the say day every month, but mostly it allows the business to deal with recurring billing issues in one swoop. If 1% of clients will have problems (credit card declined, expired, "what is this Blah,Inc" who charged me, etc), then dealing with all of those at once will be easier for staff.
It also help with cashflow management, since you will get a predicitable lump sum of money on the same day each month.