How to charge customers after three months?

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Can someone suggest that how we can charge customers after three months?

We plan to launch a three month free try-on handbags campaign. The customers pay $0 when they place the order, after three months, they return our handbags. If they don't return the bags, we need to charge their retail price for the handbags. But we don't know how we can charge the customers with Shopify.

Really appreciate your help and advise. Thank you.