[6.1、电子发票开票订单上传接口](6.1%E3%80%81%E7%94%B5%E5%AD%90%E5%8F%91%E7%A5%A8%E5%BC%80%E7%A5%A8%E8%AE%A2%E5%8D%95%E4%B8%8A%E4%BC%A0%E6%8E%A5%E5%8F%A3.md) [6.2、开票方信息查询接口](6.2%E3%80%81%E5%BC%80%E7%A5%A8%E6%96%B9%E4%BF%A1%E6%81%AF%E6%9F%A5%E8%AF%A2%E6%8E%A5%E5%8F%A3.md) [6.3、开取发票接口](6.3%E3%80%81%E5%BC%80%E5%8F%96%E5%8F%91%E7%A5%A8%E6%8E%A5%E5%8F%A3.md) [6.4、发票状态回调接口](6.4%E3%80%81%E5%8F%91%E7%A5%A8%E7%8A%B6%E6%80%81%E5%9B%9E%E8%B0%83%E6%8E%A5%E5%8F%A3.md) [6.5、查询开票状态接口](6.5%E3%80%81%E6%9F%A5%E8%AF%A2%E5%BC%80%E7%A5%A8%E7%8A%B6%E6%80%81%E6%8E%A5%E5%8F%A3.md)