Hi @ashish,
As I have described in a recent thread, Contentful is optimized for content creation, instead of specifically providing authentication to multiple users outside of a given organization.
That being the case, if most of your content is managed by people within your own organization, it may be possible that one of our plans could fit your needs:
However, if you have a section that requires the management of hundreds of external users, it might be a better idea to do this on your side, rather than relying on our authentication implementation to do so.
Let me know if that makes sense or if you have other questions 