当我想在 PayPal 中批准新的定期付款时,我得到的总金额为 0

When I want to approve new recurring payment in PayPal, I got a total amount of 0

我正在尝试在 PayPal 沙盒中测试设置新的定期付款。此请求的端点是:https://api.sandbox.paypal.com/v1/billing/subscriptions

正文:

{
      "plan_id": "P-9JP75835703395314MA2P3FQ",
      "start_time": "2021-03-04T20:00:00Z",
      "subscriber": {
        "name": {
          "given_name": "John",
          "surname": "Doe"
        },
        "email_address": "customer@example.com"
      },
      "application_context": {
        "brand_name": "example",
        "locale": "en-US",
        "shipping_preference": "SET_PROVIDED_ADDRESS",
        "user_action": "SUBSCRIBE_NOW",
        "payment_method": {
          "payer_selected": "PAYPAL",
          "payee_preferred": "IMMEDIATE_PAYMENT_REQUIRED"
        },
        "return_url": "https://example.com/returnUrl",
        "cancel_url": "https://example.com/cancelUrl"
      }
}

当我想要批准新创建的订阅时,我得到了这个: PayPal approve screen

我的问题是:当经常性金额设置为 100 PLN 时,为什么总金额为 0(在购物车图标旁边看到)?

如果您希望它立即结算,请不要指定 start_time