ProxyPanel/app/Http/Models/Payment.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Model;

class Payment extends Model
{
    protected $table = 'payment';

    public function user()
    {
        return $this->belongsTo(User::class, 'user_id', 'id');
    }

    public function order()
    {
        return $this->belongsTo(Order::class, 'oid', 'oid');
    }
}