Not able to know when the card form is submitted

[aJIEw]

Is your feature request related to a problem? Please describe.

It looks like when using the card component with session flow, there's no way to know that the shopper submitted the card form? It would be great if we can have a callback to know that the shopper submitted the card component form, because we need to prevent any further action while there's an in-progress payment.

Thanks for your great work. Cheers.

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