How to set the default API endpoint in Axios, which is a file?

Question

JavaScript

I use Axios to create a SPA on Vue.js
There is a backend with an address like:
https://backend.site.com/api.php
Any requests have the following pattern, examples:

https://backend.site.com/api.php?cmd=users
https://backend.site.com/api.php?cmd=goods&limit=20
https://backend.site.com/api.php?cmd=posts&page=2

I create an Axios instance:

const webclient = axios.create({
  baseURL: "https://backend.site.com"
})

But now in every request method I have to put in something like:
webclient.get("api.php?cmd=users").then ...
I can't figure out how to take this into account when instantiating Axios. I tried to do params, but it did not work out to get the desired result.