How do I remove parameters from a RESTMessageV2 call?

I'm new to SNOW development, so feel free to offer any level of advice here.

My scenario is this:

I created a bunch of outbound REST messages.

Some of these REST calls accept a bunch of parameters (15+) which I added in the Query Parameters of the calls.

Currently, any call on these results in an error if I don't pass something into every single parameter.

What I need is a way to allow a call to these REST messages that'll accept an arbitrary number and combination of the parameters.   How should I architect/implement this?   Any advice is appreciated.   Thanks in advance.