There are several uses for the Payment Plan or split payments Pricing model. The first is to break a large one-time payment into several monthly payment to increase sales of a given product. The second is to create an automatically cancelling subscription that behaves like a paid trial of a service. The setup for both of those scenarios is the same and we start by creating a Product in Stripe.
You will configure a Recurring product so that the customer is charged on the given billing interval. You can set the Billing period to any interval you need, and monthly is most common.
Now that we are done creating the products, for Billflow to recognize these products as a single service we need to tag it with an "sb_service" tag. This tag should be the same for all products(pricing plans) that are in the model. Next we tag each with a unique "sb_tier" that corresponds to the plan. That means we have 2 unique "sb_tier" tags for our example. Specifically for Payment Plans, we need to add a third metadata value and that is "sb_plan_iterations". Set this to the number of times the customer should be charged. For example, if you want the customer to pay $600 in 6 monthly $100 payments, the value of "sb_plan_iterations" would be 6. After 6 months, the subscription will automatically cancel.
Finally, we go back to Billflow and refresh the "Pricing Plan" page. We should see our pricing plan pop up.