有没有一种方法可以手动向laravel收银员订阅表添加订阅

Question

仅通过手动将带有相关数据的行插入Laravel/Cashier/Subscription模型中，如何为条带上的用户创建新订阅。

我已经使用此代码直接从Stripe创建并检索了订阅。

\Stripe\Stripe::setApiKey('sk_test_mykey');

$stripe_sub = \Stripe\Subscription::create([
  "customer" => "cus_mycus",
  "items" => [
    [
      "plan" => "plan_myplan",
    ],
  ]
]);

$sub = \Stripe\Subscription::retrieve(
  $stripe_sub->id
);

现在我想通过执行类似的操作来手动更新订阅表

use Laravel/Cashier/Subscription as CashierSubscription;

public function addSubscription()
{
   $subscription = new CashierSubscription;
   $subscription->user_id = auth()->user()->id;
   $subscription->stripe_plan = $sub->plan;
   $subscription->quantity = $sub->quantity;
   $subscription->trial_ends_at = $sub->trial_ends;
   $subscription->ends_at = $sub->ended_at;

   $subscription->save();

但是我得到了这个错误响应

message: Method Illuminate\Database\Eloquent\Collection::save does not exist.
exception: BadMethodCallException

请我如何手动将订阅添加到收银员的订阅模型中。