Handle the OIDC callback for SAML application and generate SAML response.
GET
/api/saml-applications/{id}/callback
curl \
--request GET 'https://[tenant_id].logto.app/api/saml-applications/{id}/callback' \
--header "Authorization: Bearer $ACCESS_TOKEN"