django rest framework where to put business logic code example

Example 1: django rest framework business logic

class CoffeeShopService(object):
        @staticmethod
        def place_order(quantity):
           # do the business logic here
           return order_id

Example 2: django rest framework business logic

def order(request, quantity=1):
        # Process the order by calling the mapped method
        order_id = CoffeeShopService.place_order(quantity)
        return HttpResponse({'order_id': order_id, mimetype='application/json')