Update UserCredentials

• Get user credential (note that the password is not included)

ARMClient.exe get /providers/Microsoft.Web/publishingUsers/web?api-version=2014-11-01

• Update user credential

ARMClient.exe put /providers/Microsoft.Web/publishingUsers/web?api-version=2014-11-01 @payload.json

sample payload.json

{
  "properties": {
    "publishingUserName": "myUserName",
    "publishingPassword": "myPassword"
  }
}