CF7 and stripe conditional Stripe payment

Hey guys, looking for some ideas.

I have a CF7 form where I want the user to choose: I need to make a payment: yes/no.

If yes then show them a Stripe payment button. Upon succesful payment – submit the form.
If the user selects no, don’t show any payment options, just submit the form.

Stripe’s simply checkout option is nice but embeds a form, so that can’t go inside the CF7 form, it’s not valid. Thinking of firing the Stripe form in a popup from within the CF7 form… any better ideas?

Thanks