Hello, What email should be sent in addition to when a specific payment or shipping method is used? After receiving the confirmation email, I want to send the user a follow-up email with any additional instructions or information.
You possibly require an email manager extension for additional/payment or ship method-specific mail.
Maybe something like https://www.virtueplanet.com/extensions/vp-email-manager
Yes.
Or maybe something like https://www.minijoomla.org/extensions/email/virtuemart-mailing-manager
Or use the payment method description and display this separately somewhere on the initial email