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Customer would like to have a Subscription that bills every 3 months, then switches to monthly after the first three months. This is not possible. But you can set up a 3 month Trial, charge a Sign-Up Fee equal to three months, and then after that the monthly billing will start. This is essentially a 3 month Subscription that converts to a monthly Subscription after 3 months.  

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Charge $15 per month

3 Months == $45

Sign-up fee is $45

Due today is $45 and then $15/month in 3 months.