请教英文高手一个问题

其实老外没这么多繁文缛节，关键是你要跟他说清楚你要他的ID和密码做什么。
只要对方同意了，一般性的语句就行，无需用太过客气的敬语。

直接一点的可以说 please provide your ID and password to me
或你用的“would you like to”句型也可以

would you please show me ID and passeword? it's indeed helpful for me, thanks.

呃.......索要ID和密码....貌似很难做了礼貌吧.....(本身要这个就是不礼貌的了...)
加点"请"或"谢谢"之类的吧.......

I appreciate if you could let me know the logon ID and password.

would you please show me ID and passeword?

Would you please provide me your registered ID and password?