If you want to run your billing functions using an external service then your main choices are cloud billing, managed cloud billing, and billing as a service, more commonly known as BaaS.
Usage-Based SaaS Pricing Models that are Easy to Explain While Not Being Based on User Licensing Fees
It’s quite common to find a business offering usage-based pricing in SaaS. The main thing for any SaaS model is how to deliver the perceived value of the product to the customer.
Subscription-based businesses evolve over time and with this evolution comes a need to have a greater level of control and flexibility over the types of plans they offer their subscribers and the prices attached to these plans.
Every business needs to set the price of their products to create revenue and profit. There’s another level to this for subscription based models as they need to create the right billing models.