old_contents: from django.contrib import admin
  
  from . import models
  
  admin.site.register(models.Payment)
  admin.site.register(models.Preference)
  admin.site.register(models.Notification)
  
new_contents: from django.contrib import admin
  
  from . import models
  
  
  @admin.register(models.Account)
  class AccountAdmin(admin.ModelAdmin):
      list_display = (
          'name',
          'slug',
      )
      prepopulated_fields = {
          'slug': ('name',),
      }
  
  
  admin.site.register(models.Payment)
  admin.site.register(models.Preference)
  admin.site.register(models.Notification)
  
subject: Add Account to the admin