Okta SAML integration in .net web api and React front end


I am working for a client and they have Okta implemented already. I have built .Net web api to send data in Json format for various business logic, through each controllers. I am trying to integrate the Okta authentication to my Web API. Users from front end should be authenticated using Okta, upon successful, they can access the web services from front end. My client wants SAML authentication and i how i can achieve this.