[Din]

Not sure about TanTrack,but the way you should do it, is to charge the amount on the same day every month. So for example you choose the 15th of the month. Regardless how many days there are, you are charging them once a month on the same day every month.

You should also be able to set it to pro-rated (variable) so that it calculates daily. If your billing day is the 15th of the month and you sign someone up on the 30th of the month, it should calculate the 15 day rate daily at say 66cents/day (if it's $19.99 a month) and charge the customer 66cents x 15 days $9.99 for the remaining days until the next billing day which is the 15th of the month. On the 15th, they'll be charged $19.99 for the next month. As they are charged in advance for the month.

TanTrack shouldn't be any different....I used to do that in Helios, you should be able to do that in TanTrack and pretty much every other tanning software that does EFT's. Just look under the membership type and select EFT or something like that, put it to variable to calculate at fluctuating cost and set the billing date to which it should calculate from.