How can I integrate FPX into FlutterFlow Stripe?

Here is my customAction to call the payment sheet

In server side, we will pass in the payment_method_types: ["fpx"] too when creating paymentIntent.

But still getting the error when place in the Client Secret in the Stripe flutter sdk.

Here is a screenshot of my Flutter project, I am able to successfully call the FPX Payment Sheet. The codes to generate paymentIntent and create Payment Sheet are almost similar.

Please help, we would like to stick to FlutterFlow as we already developed a lot of stuff inside FlutterFlow app.