template<class ...Ts>
cpr::Response MakeRequest(std::string_view method, Ts&& ...ts) { // could be enum, string, or bool. Whatever what you use to select different HTTP method
    if (method == "GET") {
        return cpr::Get(std::forward<Ts>(ts)..., cpr::Header{{"Authorization", "token"}});
    else if (method == "POST") {
        return cpr::Post(std::forward<Ts>(ts)..., cpr::Header{{"Authorization", "token"}});
    } else {
        // and so on...
    }
}

    template <cpr::HTTPMethod method, typename... Args>
    cpr::Response MakeRequest(Args&&... args) {
        return cpr::Request<method>(std::forward<Args>(args)..., cpr::Header{{"Authorization", "token"}});
    }

cpr::Response r = MakeRequest<cpr::HTTPMethod::kPost>(cpr::Url{"http://www.httpbin.org/post?a=b"}, cpr::Body{"{\"a\": true}"});