PayPal 定期付款：如何添加初始付款。

我一直在使用实现一个功能，可以使用 PayPal 进行定期付款，并发送此请求（复制自https://developer.paypal.com/webapps/developer/docs/api/#create-a-plan https://developer.paypal.com/webapps/developer/docs/api/#create-a-plan)

curl -v POST https://api.sandbox.paypal.com/v1/payments/billing-plans \
-H 'Content-Type:application/json' \
-H 'Authorization: Bearer <Access-Token>' \
-d '{
    "name": "T-Shirt of the Month Club Plan",
    "description": "Template creation.",
    "type": "fixed",
    "payment_definitions": [
        {
            "name": "Regular Payments",
            "type": "REGULAR",
            "frequency": "MONTH",
            "frequency_interval": "2",
            "amount": {
                "value": "100",
                "currency": "USD"
            },
            "cycles": "12",
            "charge_models": [
                {
                    "type": "SHIPPING",
                    "amount": {
                        "value": "10",
                        "currency": "USD"
                    }
                },
                {
                    "type": "TAX",
                    "amount": {
                        "value": "12",
                        "currency": "USD"
                    }
                }
            ]
        }
    ],
    "merchant_preferences": {
        "setup_fee": {
            "value": "1",
            "currency": "USD"
        },
        "return_url": "http://www.return.com",
        "cancel_url": "http://www.cancel.com",
        "auto_bill_amount": "YES",
        "initial_fail_amount_action": "CONTINUE",
        "max_fail_attempts": "0"
    }
}'

上述请求将创建定期定期付款。我想在上述请求中添加首付款。我找到了一种使用经典 API 的方法，如下所示https://developer.paypal.com/docs/classic/paypal- payments-pro/integration-guide/WPRecurringPayments/ https://developer.paypal.com/docs/classic/paypal-payments-pro/integration-guide/WPRecurringPayments/指定初始付款部分。但是我找不到使用 REST API 添加初始付款的方法。谢谢！

嘿，这是来自 PayPal 的 avi。其余计费计划的merchant_preferences 部分下的setup_fee 对应于经典API 中定期付款的初始付款。该费用仅在用户同意计费计划形成计费协议后收取一次。