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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Maybe you could start with https://snapcraft.io/
IMO the "correct" solution to this for both flatpaks and snaps is for Firefox to open/save/etc. files using XDG desktop portals, which were created for exactly the purpose of read/writing specific files without providing the app access to your whole drive. (Side note: They were created for flatpak, but are supported by snap too, so the single implementation can be used for both types of packaging.)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.