We're trying to build a "change password" screen in a SC extension. I came across this CAPI method: doChangePassword(Params, newPassword) But I do not understand what the first parameter of the method ("Params") is. There seems to be no clear explanation to it in the documentation as well. Anyone has an idea how to use this method?

If you are using SCA then do skim the code to check how change password works in My Account Profile.