Make changes to the current user registration form on the site and the logic associated with it

Site based on opencart. Knowledge of php and jquery will be required
The following changes must be made to the current registration form and its associated logic:
1. Remove the "patronymic" and "email" fields from the registration form and take into account changes in the registration api
2. Add the text field "Send information to the mail (optional)" with a check for the correctness of the mail input to the next screen for the standard scenario above the block "I agree with the rules" and add sending values to the api depending on whether the user specifies mail or not.
3. Extend the verification of user mail confirmation, which occurs during authorization, because during registration there was a subscription to send notifications to the mail