config-service/app/Transformers/UserTransformer.php

<?php

namespace App\Transformers;

use App\User;
use League\Fractal\TransformerAbstract;

class UserTransformer extends TransformerAbstract
{

    public function transform(User $user)
    {
        return [
            'mobile'    => $user['mobile'],
            'avatarurl' => $user['avatarurl'],
            'gender' => $user['gender'],
        ];
    }
}