vuefilemanager/app/Http/Resources/PlanResource.php

<?php
namespace App\Http\Resources;

use Laravel\Cashier\Cashier;
use Laravel\Cashier\Subscription;
use Illuminate\Http\Resources\Json\JsonResource;

class PlanResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param \Illuminate\Http\Request $request
     * @return array
     */
    public function toArray($request)
    {
        // Get subscribers
        $subscriber_count = Subscription::where('stripe_plan', $this['plan']['id'])
            ->where('stripe_status', 'active')
            ->get();

        return [
            'data' => [
                'id' => $this['plan']['id'],
                'type' => 'plans',
                'attributes' => [
                    'subscribers' => $subscriber_count->count(),
                    'status' => $this['plan']['active'] ? 1 : 0,
                    'name' => $this['product']['name'],
                    'description' => $this['product']['description'],
                    'price' => $this['plan']['amount'],
                    'price_formatted' => Cashier::formatAmount($this['plan']['amount']),
                    'capacity_formatted' => format_gigabytes($this['product']['metadata']['capacity']),
                    'capacity' => (int) $this['product']['metadata']['capacity'],
                    'created_at_formatted' => format_date($this['plan']['created']),
                    'created_at' => $this['plan']['created'],
                ],
            ],
        ];
    }
}