FormAction submit method in Rasa 3.0

@anoopshrma please cross-check the link you shared it opening a migration guide at my side.

Anyways if you are using Rasa 3.X please visit this rasa form example repo : https://github.com/RasaHQ/rasa-3.x-form-examples/blob/main/05-validation/actions/actions.py

I hope this will help you, and in FormValidation we use the word Validation after class please ref this: Forms

Demo code:

class ValidateRestaurantForm(FormValidationAction):
    def name(self) -> Text:
        return "validate_restaurant_form"

OR if I’m missing something do inlighten me, I hope this will help you.