fix authflowreq marshalling

internal/endpoints/token/super/pkg/authCodeFlowRequest.go

@@ -13,7 +13,7 @@ const (
 // AuthCodeFlowRequest holds a authorization code flow request
 type AuthCodeFlowRequest struct {
 	OIDCFlowRequest
-	RedirectType string `json:"redirect_type"`
+	RedirectType string
 }
 
 // Native checks if the request is native
@@ -30,3 +30,9 @@ func (r *AuthCodeFlowRequest) UnmarshalJSON(data []byte) error {
 	*r = tmp.ToAuthCodeFlowRequest()
 	return nil
 }
+
+// MarshalJSON implements the json marshaler interface
+func (r *AuthCodeFlowRequest) MarshalJSON() ([]byte, error) {
+	r.redirectType = r.RedirectType
+	return json.Marshal(r.OIDCFlow)
+}