Hey Matej, my apologies for missing your reply here.
That is correct, any method to programmatically open a modal won’t be supported. Opening a modal will always have to be activated by buyer input, and only one modal can be open at once, meaning you couldn’t achieve you’re desired flow using multiple modals here.
However, I do want to call out that I think it is a better user experience to keep the whole flow with each step inside one modal. The transitions with multiple modals opening and closing will lead to a rather jumpy user experience.