Soap/app/Models/ApplyCustomer.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class ApplyCustomer extends Model
{
    protected $connection = 'mysql_app';
    protected $table='customer_apply';

    public function applydetail(){
        return $this->hasMany(ApplyCustomerDetail::class,'customer_id','id');
    }
}