There's probably some docs in arubapedia, but have you also looked into the built in XML docs in AirWave? Under Home -> Documentation -> Interfacing w/ AMP -> there's a few XML API html guides. As for the AMP MIBs, you can get them from the AMP Setup -> NMS tab, there's no actual guide for using the MIBs. If there's any missing documentation, you can probably probe AW-PLM or the TME group.