Stripe: Manually Create Subscription for a Buyer

If a user sent you a one-time payment using Stripe, you can manually create a subscription for the user from within your Stripe dashboard. 

Here is a gif showing where you can do that in your Stripe dashboard: 

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In your Stripe account, 

1. Go to Billing > Subscriptions
2. Click Create New
3. Select a customer who previously sent you a one-time payment
4. Select a product that you wish to subscribe the customer to
5. Choose a payment method (depending on your settings, you may have to start with it sending an invoice to the customer instead of it auto-charging the customer)

Your customer will then be billed or receive an invoice at the frequency specified in the original product.