哪个 Paypal API 用于预先批准付款？
我正在尝试在完全自定义的购物车上实施 PayPal，但无法确定我们需要哪个 API 来进行定期付款。
我们每 2、3、4、6 个月发货一次实物产品，因此发货和付款必须同时进行。此外，用户必须能够轻松更改其发货日期，或者在常规发货中添加或删除物品，而不会造成太大压力（无论是他们还是我）。
我通常查看 Paypal 的定期计费更适合基于软件的订阅，我认为这不是我需要的 API。我想通过计费协议向客户开具账单，然后开始发货。
Skype 的做法似乎很理想 - 他们建立了一个计费协议（显示在我的 PayPal 帐户中的“我的帐户 > 个人资料 > 付款列表”下） 但我似乎无法在 SOAP API 文档。
我需要什么 API 来创建一个可以随时触发的计费协议。这可以通过 Express Checkout API 来完成吗？
I'm trying to implement PayPal on a completely custom shopping cart and have been unable to figure out which API for recurring payments we need.
We ship a physical product every 2, 3, 4, 6 months so shipment and payment have to both happen together. In addition it must be easy for the user to change their shipment date - or add or remove items to their regular shipments without too much stress (either on their part or mine).
I've generally looked at Paypal's recurring billing as more suited to software based subscriptions and I don't think this is the API I need. I'd like to just bill the customer via a billing agreement and then initiate the shipment.
The way Skype does it seems to be ideal - they establish a billing agreement (shown in my PayPal account under 'My account > Profile > Pay List'
but I cannot seem to find that in the SOAP API document.
What is the API I need to create a billing agreement that I can trigger whenever I want. Can this be done with Express Checkout API ?
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您正在寻找的 API 称为参考交易。这允许您与客户建立计费协议，取回令牌，然后使用该令牌在将来发出费用。可以通过 Express Checkout API 来完成。
您必须联系 PayPal 客户支持，为您的帐户激活此功能，然后才能使用它。
The API you are looking for is called reference transactions. This allows you to set up a billing agreement with a customer, get back a token, and then use that token to issue charges in the future. It can be done via the Express Checkout API.
You have to contact PayPal customer support to get this activated for your account before you can use it.