在 PAYPAL 中创建订阅后捕获授权付款时出现以下错误。如果有人知道为什么会发生或有任何解决方案，请回复。

用于捕获给定订阅 ID 的付款的代码。下面给出的内容包含错误。

$provider = new PayPalClient;
$provider->getAccessToken();
$response = $provider->captureSubscriptionPayment($request->input('subscription_id'), 'capturing payment', (float)$package->price);

错误：-

`{
    "name":"UNPROCESSABLE_ENTITY",
    "message":"The requested action could not be performed, semantically incorrect, or failed business validation.",
    "debug_id":"2e3384fe1998b",
    "details":[
        {
            "issue":"ZERO_OUTSTANDING_BALANCE",
            "description":"Current outstanding balance should be greater than zero."
        }
    ],
    "links":[
        {
            "href":"https://developer.paypal.com/docs/api/v1/billing/subscriptions#UNPROCESSABLE_ENTITY",
            "rel":"information_link","method":"GET"
        }
    ]
}`

{
    "name":"UNPROCESSABLE_ENTITY",
    "message":"The requested action could not be performed, semantically incorrect, or failed business validation.",
    "debug_id":"b1c0f40b4e56b",
    "details":[
        {
            "issue":"AMOUNT_GREATER_THAN_OUTSTANDING_BALANCE",
            "description":"The new outstanding balance can not be greater than the current outstanding balance."
        }
    ],
    "links":[
        {
            "href":"https://developer.paypal.com/docs/api/v1/billing/subscriptions#UNPROCESSABLE_ENTITY",
            "rel":"information_link","method":"GET"
        }
    ]
}

另一个问题是，通过 API 创建产品、计划和订阅后，这些创建的产品、计划和订阅在仪表板（沙盒 Paypal 帐户）中不可见。但是当通过 api 检索时，我得到了所有详细信息。请告诉我为什么会发生或者在哪里可以看到这些。

ps：我正在使用 https://srmklive.github.io/laravel-paypal/docs.html api 来创建产品/计划/订阅。