Hi Eddy, another option as @ram.gandhi has mentioned here is 
SCIM . Here Okta can send existing user info to your app, that way new users (with companies using Okta as an IdP) can log in with SSO immediately. Ram has written a blog on this. If decide you want to make this available to multiple customers, you can submit your SSO and SCIM integration to our Okta Integration Network. If you have any questions about submitting to the OIN you can join us at our integrators office hours.