Since 7.12 https://docs.mendix.com/releasenotes/studio-pro/7.12#fixes it says “Custom handlers can now access the body of
application/x-www-form-urlencoded requests. (Ticket 61729)”. Nothing more than that and no help to you since you can see the entire body already. So likely your stuck with building the parsing yourself.
Maybe this also helps: https://www.urldecoder.org/
You have access to the body when your microflow takes a System.HttpRequest parameter. The microflow would need to parse the body.
Is this the api that you are using?
if so, it looks like you will get a response that looks similar to this
token=gIkuvaNzQIHg97ATvDxqgjtO &team_id=T0001 &team_domain=example &enterprise_id=E0001 &enterprise_name=Globular%20Construct%20Inc &channel_id=C2147483705 &channel_name=test &user_id=U2147483697 &user_name=Steve &command=/weather &text=94070 &response_url=https://hooks.slack.com/commands/1234/5678 &trigger_id=13345224609.738474920.8088930838d88f008e0
and you are looking for an easy way to parse this.
I dont think there is a native way to do this but the community commons module has a string split java action. You can use that to split on the ‘&’ and the ‘=’ (like you mentioned above).
The microflow would look similar to this
Once you get the parameter values, you can use the urlDecode string function.
Hope this helps!