For communication with a given Endpoint (german DATEV), our code is required to make use of PKCE (https://www.rfc-editor.org/rfc/rfc7636).
It's possible to hook into OpenIdConnectEvents.OnRedirectToIdentityProvider and compute and put 'code_challenge' and 'code_challenge_method' data into the given ProtocolMessage.Parameters for transfer into the authorization-query.
Is that the only way to enable PKCE with OpenIdConnect?
Thanks for any hints!