3, 'logger' => true,//是否开启日志，yansongda/pay v3版本有效 /* |-------------------------------------------------------------------------- | 退款单编号前缀 |-------------------------------------------------------------------------- */ 'refund_no_counter_prefix' => 'RF', /* |-------------------------------------------------------------------------- | 退款单编号计数器位数，取值范围 6 - 16 - 退款编号前缀位数 |-------------------------------------------------------------------------- */ 'refund_no_counter_length' => 6, ];