How to read messages betwen users & resolution center

Hi team,
1-How can I read private messages between Buyers and vendors? example, if I need to be intermediary in a dispute so I need to read and capture immage, any suggestion?

2-I want to offer guaranty that my platform will be the judge between buyer and frelancer if one part doesn’t keep his agreement and any part want to cancel…exist claim or cancelation area or pluging?..do you have any guide how to do it?

3-The example of cancelation process in Fiverr https://www.fiverr.com/support/articles/360010452537#h_01FHX4767KF1GSFF86Q4TSA3HA
Exist the way for RESOLUTION CENTER as Fiverr or I n eed to develop it?