Php 条带：预览即将发布的发票以更新订阅

如何正确获取升级/降级订阅时我将要支付的未来发票（账单大小）？因此，它将考虑应用的息票、当前余额/信用（降级后）等

像这样尝试：

\Stripe\Invoice::upcoming([
    "customer" => $user->stripe_id,
    "subscription" => 'sub_XXXXXXXXXXX', // current user subscription (monthly)
    "subscription_prorate" => true,
    "subscription_items" => [
        ["plan" => "plan_XXXXXXXXXXX"] // plan for upgrade (annually)
    ]
]);

"subscription_items" => [
    ["id" => "currentPlanId", deleted => true]
    ["plan" => "plan_XXXXXXXXXXX"] // plan for upgrade (annually)
]

但是我得到了“Stripe\Error\InvalidRequest:货币和间隔字段必须在该订阅的所有计划中匹配。在间隔字段中发现不匹配。”

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我知道我弄错了，所以请告诉我应该怎么做？

我最近在使用.NET客户端时遇到了一个类似的错误，我很确定问题是相同的。如果要更新订阅的计划，它们必须具有相同的货币和间隔。例如，订阅不能在月度计划中包含一个项目，而在年度计划中包含另一个项目。如果要预览不同时间间隔的计划之间的切换，必须明确删除旧计划。我的PHP已经生锈了，但我猜是这样的：

\Stripe\Invoice::upcoming([
    "customer" => $user->stripe_id,
    "subscription" => 'sub_XXXXXXXXXXX', // current user subscription (monthly)
    "subscription_prorate" => true,
    "subscription_items" => [
        ["plan" => "plan_XXXXXXXXXXX"] // plan for upgrade (annually)
    ]
]);

"subscription_items" => [
    ["id" => "currentPlanId", deleted => true]
    ["plan" => "plan_XXXXXXXXXXX"] // plan for upgrade (annually)
]

查看stripe仪表板中的更新订阅表单有助于我更好地理解这一点。可以肯定的是，以前版本的API不能以这种方式工作