to add query params there is 2 ways
pm.request.addQueryParams("auth_username={{username}}")
pm.request.url.query.add("auth_password={{password}}")
you can loop over pm.request.url.query
it is an array of objects, every object has 3 properties
{
disabled: true, // only if it is disabled
key: "auth_username",
value: "{{username}}",
}
you can find what you are looking for and set it like you wan’t