You card is charged automatically on a weekly/monthly (every 4 weeks) basis.
Once you select your subscription plan (number of lessons per week X by duration of lessons), we will issue your 1st invoice via stripe. You credit card will be charged on the same day of the week when you process the payment for the first invoice. Each payment will include a processing fee in the amount of $1.00. For example you decide to take 5 classes per week 45 minutes long each. This means that you will be charge $31 on a weekly basis ($6 per lesson X 5 times per week +$1 processing fee).