INSTALLED_APPS = [
    ...,
    'django-payment',
]
PAYMENT_SETTINGS = {
    'BACKENDS': {
        'ECPAY': {
            'MERCHANT_ID': '2000132',
            'HASH_KEY': '5294y06JbISpM5x9',
            'HASH_IV': 'v77hoKGq4kWxNNIS',
            'EXPIRE_DATE': 7,
            'TEST': True,
            # 測試環境用 Tue, 實際環境用False
        }
    }
}

PAYMENT = {
    'BACKENDS': [
        # 使用的 BACKEND
        'payment.backends.ecpay.backend.ECPayAIOBackend',
    ],
    'PRODUCTS': [
        # 註冊產品
        'product.products.ProductOne',
    ],
    'SUCCESS_PIPE': [
        # 非必要
        # 無關產品本身的事件可以放這裡, 像是寄email通知之類的
        'product.pipes.increment',
    ]
}

class Book(models.Model):
    '''
        示範用, 書的Model

    '''
    book_title = models.CharField(max_length=16) # 書名
    book_description = models.CharField(max_length=16) # 書的描述
    book_price = models.PositiveIntegerField() # 價錢
    buyers = models.ManyToManyField('auth.User', through='product.BookOwner') # 購買者, 連結到下面的BookOwner
    is_active = models.BooleanField(default=False) # 是否上架

class BookOwner(models.Model):
    '''
        示範用, 購買的人
    '''
    user = models.ForeignKey('auth.User')
    book = models.ForeignKey(Book)

from rest_framework import serializers
from payment.products import ProductSerializer
from .models import Book


class BookProductSerializer(ProductSerializer):
    name = serializers.CharField(source='book_title') # 產品名稱
    price = serializers.IntegerField(source='book_price') # 產品價錢 book.book_price
    description = serializers.CharField(source='book_description') # 產品描述 book.book_description

    class Meta:
        model = Book
        # 產品的 Model

        fields = ('name', 'price', 'description')
        # 基本上就需要這 3 欄而己

from payment.products import Product


class BookProduct(Product):

    name = 'book'
    # 產品的英文名字, 盡量只用SlugField的字元吧, 未來會強制使用slug

    serializer_class = BookProductSerializer
    # 取得產品名字, 描述, 跟價錢的class


    return_view_name = 'return_page'
    # 付款完成後的訂單頁 reverse('return_page', kwargs={'pk': order.pk})


    view_name = 'product_info'
    # 產品頁面 reverse('product_info', kwargs={'pk': product.pk})

    class Meta:
        model = Book

    def apply(self, user, product):
        # 到款後, 讓交易成立
        BookOwner.objects.create(user=user, book=product)

    def is_active(self):
        # 檢查產品是否可以購買
        return self.item.is_active and slef.item.book_price

urlpatterns = [
    ...,
    url(r'^pn/', include('payment.urls'))
]

{
    'backend': 'ecpay_aio', # 綠界後端
    'product_type': 'book',
    'product_id': product.id, # Book.id
    'price': product.book_price, # Book.book_price
    'payment_method': 'aio', # 綠界的All In One
}