These parameter values can be obtained from the partial URL which results from clicking on the service name on the preferences and service page
USERID parameter:
format: non-zero integer
example: USERID=2060
For purposes of compliance with Applicable Laws, you may receive instructions to use different UserIDs for different Service Implementations
APPID parameter: this is the ID of the service to use.
format = text
example: APPID=P
KEY parameter: this is the key used to allow use of the service
format: text
example: KEY=0x