Custom variables to actions / bulksms

Custom variables to actions / bulksms

Hi there,

we use ACTIONS to trigger SMS via our Enterprise bulksms Account. This works pretty well, no issue at all. 

Now we want to use the Site24x7 "send custom parameters" and use these parameters in our HTTP GET string as defined in the action.

Right now this works perfectly fine:
Action: https:/bulksms/api?username=myusername&password=mypassword&message=$MONITORNAME+is+$STATUS&msisdn=123456789

Today my action string is insanely long, because it contains a list of "mynumber", what is working fine, but is hard to maintain. therefore I want to use the customer parameter box like mynumber=123456. 

But how do I have to use the custom variables in the action string?

Something like the following does not work:

Action: https:/bulksms/api?username=myusername&password=mypassword&message=$MONITORNAME+is+$STATUS&msisdn=$mynumber


thanks for your help
Markus