Stripe webhook

I'm using laravel 5.1 and Cashier 5.0. i'm trying to test stripe webhook but im getting the following error when i try to pass test payload.

        $this->post('stripe/webhook',[
            "id" => "evt_00000000000000",
            "type" => "customer.subscription.deleted",
            "data" => [
                "object" => [
                    "customer" => $user1->stripe_id
                ]
            ]
        ]);

[2017-06-02 10:50:27] testing.ERROR: Undefined index: id [2017-06-02 10:50:27] testing.ERROR: ErrorException: Undefined index: id in /home/vagrant/server/vendor/laravel/cashier/src/Laravel/Cashier/WebhookController.php:24

But when i hit url from postman i dont have any issues