How the plugin authenticates to a provider's token endpoint.
'client_secret_basic'
Authorization
'client_secret_post'
'none'
0.8.0
How the plugin authenticates to a provider's token endpoint.
'client_secret_basic'— the credential pair in theAuthorizationheader.'client_secret_post'— the pair as form fields.'none'— a public client: no credential, PKCE only.