text: from django.contrib import admin
  from store.models import Customer, ProductCategory, Product, Order, OrderItem
  
  admin.site.register(Customer)
  admin.site.register(ProductCategory)
  admin.site.register(Product)
  
  
  class OrderItemInline(admin.TabularInline):
      model = OrderItem
      extra = 0
  
  
  @admin.register(Order)
  class OrderAdmin(admin.ModelAdmin):
      list_display = [
          'customer', 'registrated_at', 'is_complete', 'transaction_id']
      inlines = [OrderItemInline]
  