POST /

Content-Type: application/x-www-form-urlencoded

Action=ModifyIpam&AddOperatingRegion.1.RegionName=__RegionName__&AddOperatingRegion.2.RegionName=__RegionName__&Description=__Description__&DryRun=true&EnablePrivateGua=true&IpamId=__IpamId__&MeteredAccount=ipam-owner&RemoveOperatingRegion.1.RegionName=__RegionName__&RemoveOperatingRegion.2.RegionName=__RegionName__&Tier=free&Version=2016-11-15