def get_pay_mch(self):
return self._post(<EOL>'<STR_LIT>',<EOL>params={<EOL>'<STR_LIT:action>': '<STR_LIT>',<EOL>},<EOL>data={},<EOL>)<EOL>
查询商户号与开票平台关联情况
详情请参考
https://mp.weixin.qq.com/wiki?id=mp1496561731_2Z55U

:return: mchid 和 s_pappid
:rtype: dict