Flutter App add sign up email with generated password

Have an existing flutter app and want to add an auto generated email after signup that creates users password. Purpose: We are seeking to implement a preliminary feature which makes it difficult for ill-intentioned actors/users to create several accounts without an intention to use the service for its intended use. Furthermore, we want to preemptively gear the service towards users with real/verified identities. General: Upon signing up for the service the user will be required to designate an email address, but will not be required to designate a password. Requirements: • Remove password field/requirement from Sign Up page (found by clicking the Sign up button from the Log-in page. • Implement a service that, upon profile creation, sends a confirmation email to the email provided with a randomized string of characters which will be the user’s preliminary password for logging in. • Add the ability for a user to change their password (if they are signed in). This ability should be located in EITHER the Settings page (found through the navigation menu) OR the Edit Profile page (found by clicking “Edit Profile” when in the Navigation Menu).