lafafm-checkout-email

[vital pendant]

No, that would be something you would have to build yourself - before redirect to the checkout page you could ask your user to enter in an email address. If this is an email address that is already tied to a customer you would create the Checkout Session and pass in customer. Otherwise, you would pass in the email address they entered into customer_email to prefill it on the session page

[dire shell]

Is it the only way?

Do checkout form has any hooks / events triggered during checkout process that could interrupt it?

[vital pendant]

What I suggested would be the only way to do this