ldc-crm/app/Http/Requests/Api/V2/SingleOptinRequest.php

<?php

namespace App\Http\Requests\Api\V2;

class SingleOptinRequest extends BaseApiRequest
{
    public function rules(): array
    {
        return [
            'email' => 'required|email:rfc,dns,spoof,filter',
            'opt_in' => 'required|boolean'
        ];
    }
}