How to make money on an OpenAI Assistant based webapp

We developed US FDA regulatory app by collecting public domain FDA published contents and exposing them to generative AI/ML ChatGpt-4.
The app consumes credits we pay for but offer Free to site visitors.
How can we convert th Free access such that after Free Trial any PAI from OpenAI consumed (RPM, RPD or TPM, TPD) is billed to the user/customer?
Is there an OpenAI partnert portal ?

Charge a subscription. Most sites you see that run “free information” are ad supported. If you aren’t running ads, charge a subscription. Then you cover the cost of ChatGPT in a month.

Thanks Nicholas.
We plan to both.

Banner ads will sold to Sponsors.
Paid monthly subscription for those who wish to avail of our SmartSearch±- ie. a full-text keyword search on FDA contents hosted at our Sharepoint Online portal site.

We’re positioning SmartSearch+ as the one true way You-th-Human can fact check AI/ML generative ChatGPT-4 bias! If the FDA publishes Guidance PDFs or 21 CFRs regulations-you’ll find it! no AI/ML hiccups. :robot::pill::disguised_face: