How to make registration of new Django users by invites (invitations) from other users?

Question

Django

It is required to register a user using an invite code received from a previously registered user

. The user enters an invite and a password. The system generates a nickname itself in case of a successfully found invite.
At the time of registration, the system checks the invite, in case of successful finding it generates a username, by invite it finds the nickname of the one who invited the registered user and creates a record about the new user (see code)

The model is as follows:

# myapp/model.py
from django.db import models
from django.contrib.auth.models import AbstractBaseUser

class Users(AbstractBaseUser):
    def login_gen():
        import uuid
        uuid = uuid.uuid4()
        return str(uuid)[:8], uuid

    id = models.BigAutoField(primary_key=True)
    username = models.CharField("Имя пользователя", max_length=8, null=False, blank=False, db_index=True, unique=True, default=login_gen()[0])
    password = models.CharField("Пароль", max_length=255, null=False, blank=False)
    role = models.BooleanField("Физ или юр", null=False, blank=False)
    inviter = models.ForeignKey(verbose_name='Кто пригласил', self.id, null=False, blank=False)
    #... другие поля
    UUID = models.UUIDField("UUID", null=False, blank=False, default=login_gen()[1])
    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = ['username', 'password', 'role']
    def __str__(self):
        return self.username

I would like to implement the task with the authentication tools built into Django, but I just can’t cope with the user model, form and manager, and possibly views