https://developer.paypal.com/docs/checkout/apm/reference/subscribe-to-webhooks
https://developer.paypal.com/docs/checkout/apm/reference/handle-uncaptured-payments/
Dianjiang客户遇到的问题MTS那边查出来了。买家确实通过Ideal付款了，但是可能付款后直接关闭窗口，导致Dianjiang那边没有获取approval的信息，3小时以后自动退款了。需要让Dianjiang那边多订阅两个webhooks，如果收到approval的WH，也可以进行capture
之后单独做APM按钮的话，这两个点也是需要做的
https://developer.paypal.com/docs/checkout/apm/ideal/#link-knowbeforeyoucode 不知道是不是有什么特别的问题
另外MTS还给了另外一个解决思路：
Also, Pass "processing_instruction" : "ORDER_COMPLETE_ON_PAYMENT_APPROVAL" in Create Order API call to automatically capture the payment as soon as it gets approved by the buyers/customers. This option is only available for the following payment_source: Alipay, Bancontact, BLIK, boletobancario, eps, giropay, GrabPay, iDEAL, Multibanco, MyBank, OXXO, P24, PayU, PUI, SafetyPay, SatisPay, Sofort, Trustly, Verkkopankki, WeChat Pay
Please make sure that you're subscribed to the following webhook events:
- CHECKOUT.ORDER.APPROVED - Listen for this webhook and then capture the payment.
- CHECKOUT.PAYMENT-APPROVAL.REVERSED - Listen for this webhook as an indication that an approved order wasn't captured within the capture window resulting in a cancellation of the order and a refund to the buyer's account. Then notify your buyer of the problem and the reversed order.
"processing_instruction" : "ORDER_COMPLETE_ON_PAYMENT_APPROVAL" 要同时指定payment_source是ideal，而且只能跟srandalone button一起用，确实不用capture会自动执行capture