PHP | Stripe API-检查客户是否附有卡

我正在尝试为我的网站设置条带API，但遇到了一个问题。我需要检查客户是否有信用卡，以便处理订阅计划

在他们的文档中，我似乎找不到任何与此相关的内容：

客户的输出如下所示：

Stripe\Customer JSON: {
  "id": "CUSTOMER_ID",
  "object": "customer",
  "account_balance": 0,
  "created": 1474620297,
  "currency": "dkk",
  "default_source": null,
  "delinquent": false,
  "description": null,
  "discount": null,
  "email": "",
  "livemode": false,
  "metadata": {
  },
  "shipping": null,
  "sources": {
    "object": "list",
    "data": [

    ],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/CUSTOMER_ID/sources"
  },
  "subscriptions": {
    "object": "list",
    "data": [

    ],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/CUSTOMER_ID/subscriptions"
  }
}

$customer = \Stripe\Customer::retrieve($customerID);
$cardID = $customer->default_source;

if(isset($cardID)){
    echo $cardID;
} else {
    echo "No card";
    //Code for entering card info..
}

---

那么，如何检查客户是否有信用卡？

尝试以下方法：

Stripe\Customer JSON: {
  "id": "CUSTOMER_ID",
  "object": "customer",
  "account_balance": 0,
  "created": 1474620297,
  "currency": "dkk",
  "default_source": null,
  "delinquent": false,
  "description": null,
  "discount": null,
  "email": "",
  "livemode": false,
  "metadata": {
  },
  "shipping": null,
  "sources": {
    "object": "list",
    "data": [

    ],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/CUSTOMER_ID/sources"
  },
  "subscriptions": {
    "object": "list",
    "data": [

    ],
    "has_more": false,
    "total_count": 0,
    "url": "/v1/customers/CUSTOMER_ID/subscriptions"
  }
}

$customer = \Stripe\Customer::retrieve($customerID);
$cardID = $customer->default_source;

if(isset($cardID)){
    echo $cardID;
} else {
    echo "No card";
    //Code for entering card info..
}

在那里你会得到卡片id，然后你可以简单地检查你是否得到了什么。若顾客有一张卡，你们就可以得到卡的id，若顾客并没有卡，你们就什么也得不到

$cards = Customer::retrieve(STRIPE_CUSTOMER_ID)->sources->all([
    'object' => 'card'
])->data;

它将返回一个卡对象数组，如果没有卡，则返回一个空数组

if($cards == []) {
    // no cards exist for user
}

---

我如何检查它是否有什么问题？