get https://identbeta.familysearch.org/cis-web/oauth2/v3/authorization
The Authorization resource is used to initiate the process for obtaining an authorization code that can be used to obtain an access token.
The Authorization resource is the Web page where a user is to be directed to authenticate. Upon successful authentication, the user will be redirected to the specified redirect URI with the authorization "code" and "state" query parameters as defined by RFC 6749, Section 4.1.2. If authorization is unsuccessful, the user will be redirected to the specified redirect URI with the "error" query parameter as defined by RFC 6749, Section 4.1.2.1.