app-api/app/Models/Amount.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Amount extends Model
{
    use SoftDeletes;

    protected $connection = 'mysql_w';
    protected $table='amount';
    protected $guarded=[];

    public function refund_money()
    {
        return $this->belongsTo(OrderRefundMoneyW::class,'transaction_id','refund_no');
    }

}