Need an advice regarding the best *PII and PCI compliant tools* to use for my case

Hi there, I am looking to create an event registration site for my client who’s in the health sector, which means wherever the data is stored, it should be PII and PCI compliant.

I want to allow users to pay for an event then have access to gated data (video and PDFs mostly).

Any thoughts about the best way of doing this, given the security restrictions?
Memberstack does not comply with these security standards, and I am not sure that Webflow either, so looks like I’ll have to find another source that is able to integrate with Webflow CMS… or maybe I’ll have to have the CMS done outside Webflow in another source?

Any info/tips will be highly appreciated! Thanks.