example-code/php-laravel/app/Models/Supplier.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

use App\Models\Service;

class Supplier extends Model
{
    use HasFactory;

	public function service() {
		return $this->belongsTo(Service::class);
	}
}