1 . By informing the username and password on the URL you will be setting the "Use these credentials" option. If you don't inform username or password, the behavior will follow the "Ask for new credentials" options'.
The "Use the authenticated credentials" option is not suppose to work with the One Time URL, because in this case there is no prior authentication with a valid user for the remote machine.
To add each of the parameters to the queryString, you have to concatenate an "&" symbol, the name of the parameter, the "=" symbol and the value assigned to the parameter, as shown on the example below :