pospal 银豹收银系统SDK 安装 composer require hanson/pospal:dev-master 文件 实例化 $ pospal = new \ Hanson \ Pospal \ Pospal ([ 'url' => 'your-url' , 'app_id' => 'your-app-id' , 'app_key' => 'your-app-key' , ]); 销售单据API 单据实例 $ ticket = $ pospa