vuefilemanager/app/Http/Requests/Subscription/StoreUpgradeAccountRequest.php

<?php
namespace App\Http\Requests\Subscription;

use Illuminate\Foundation\Http\FormRequest;

class StoreUpgradeAccountRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            // Billings
            'billing' => 'required|array',
            'billing.billing_address' => 'required|string',
            'billing.billing_city' => 'required|string',
            'billing.billing_country' => 'required|string',
            'billing.billing_name' => 'required|string',
            'billing.billing_phone_number' => 'required|string',
            'billing.billing_postal_code' => 'required|string',
            'billing.billing_state' => 'required|string',

            // Payment
            'payment' => 'required|array',
            'payment.type' => 'required|string',
            'payment.meta' => 'required|sometimes|array',
            'payment.meta.pm' => 'required|sometimes|string',

            // Plan
            'plan.data' => 'required|array',
            'plan.data.attributes' => 'required|array',
            'plan.data.attributes.capacity' => 'required|digits_between:1,9',
            'plan.data.attributes.capacity_formatted' => 'required|string',
            'plan.data.attributes.currency' => 'required|string',
            'plan.data.attributes.description' => 'sometimes|string|nullable',
            'plan.data.attributes.name' => 'required|string',
            'plan.data.attributes.price' => 'required|string',
            'plan.data.id' => 'required|string',
            'plan.data.type' => 'required|string',
        ];
    }
}