The only thing I would add if I wrote my own answer is to allocate money to be spent for the next month from money made during the previous month. (money.stackexchange.com)
At the end of the first month, you'll be charged for the next month's base rate as well as any miles driven during the previous month. (metromile.com)
If a member of Romantic Dating Online spent over 500 video credits in Private Video Chat during previous month, he is not charged the membership fee for the next month. (romanticdatingonline.com)