diff --git a/DESCRIPTION b/DESCRIPTION
index a1ff52b..466aa66 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,12 +1,13 @@
 Package: auth0
 Type: Package
 Title: Authentication in Shiny with Auth0
-Version: 0.2.4
+Version: 0.3.0
 Authors@R: c(
     person("Julio", "Trecenti", email = "julio.trecenti@gmail.com", role = "cre"),
     person("Daniel", "Falbel", email = "dfalbel@gmail.com", role = "aut"),
     person("José", "Jesus", email = "jjesusfilho@gmail.com", role = "ctb"),
     person("Dean", "Attali", email = "daattali@gmail.com", role = "ctb"),
+    person("William", "Amorim", email = "TheWilliam89@gmail.com", role = "ctb"),
     person("C", "Lente", email = "c@lente.dev", role = "ctb"))
 Description: Uses Auth0 API (see <https://auth0.com> for more 
     information) to use a simple authentication system. It provides 
@@ -16,7 +17,7 @@ BugReports: https://github.com/curso-r/auth0/issues
 License: MIT + file LICENSE
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.3.2
+RoxygenNote: 7.3.3
 Imports: httr,
     shiny,
     yaml,
diff --git a/NEWS.md b/NEWS.md
index e9e7bd5..abb9420 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,9 @@
-# auth0 0.2.4
+# auth0 0.3.0
 
-- fix issue #101, which was caused by incorrect parenthesis in `gsub()` function (Thanks to @teofiln for the PR #102)
+- Fix issue #101, which was caused by incorrect parenthesis in `gsub()` function (Fixed by @teofiln)
+- Add `request_extra_params` option to `_auth0.yml` file, to allow passing extra parameters to the authorization endpoint (Issue #100).
+- Custom URL params will no longer be removed after successful authentication.
+- Add `remove_callback_params` param to `shinyAppAuth0()` function to remove `code` and `state` callback parameters after successful authentication.
 
 # auth0 0.2.3
 
diff --git a/R/auth0.R b/R/auth0.R
index 084737c..13c8c13 100644
--- a/R/auth0.R
+++ b/R/auth0.R
@@ -69,10 +69,11 @@ auth0_info <- function(config) {
   api <- auth0_api(conf$api_url, conf$request, conf$access)
   audience <- conf$audience
   rurl <- config$remote_url
+  extra_params <- config$request_extra_params
   # backward compatibility
   if (is.null(rurl)) rurl <- config$shiny_config$remote_url
-  list(scope = scope, state = state, app = app, api = api, audience=audience,
-       remote_url = rurl)
+  list(scope = scope, state = state, app = app, api = api, audience = audience,
+       remote_url = rurl, extra_params = extra_params)
 }
 
 #' Parse `_auth0.yml` file.
diff --git a/R/logout.R b/R/logout.R
index 3cfd88c..de2a2fd 100644
--- a/R/logout.R
+++ b/R/logout.R
@@ -47,17 +47,14 @@ logoutButton <- function(label = "Log out", ..., id = "._auth0logout_") {
 #'
 #' @export
 logout_url <- function() {
+
   config <- auth0_config()
-  # Use the base URL from the redirect_uri (without the current path)
-  base_url <- sub("(https?://[^/]+).*", "\\1", redirect_uri)
-  app_url_enc <- utils::URLencode(base_url, reserved = TRUE)
 
-  logout_url <- sprintf(
-    "%s/v2/logout?client_id=%s&returnTo=%s",
-    config$auth0_config$api_url,
-    config$auth0_config$credentials$key,
-    app_url_enc
-  )
+  app_url_enc <- utils::URLencode(redirect_uri, reserved = TRUE)
+  logout_url <- sprintf("%s/v2/logout?client_id=%s&returnTo=%s",
+                        config$auth0_config$api_url,
+                        config$auth0_config$credentials$key,
+                        app_url_enc)
   logout_url
 }
 
@@ -74,14 +71,13 @@ logout_url <- function() {
 #'
 #' @export
 logout <- function() {
+
   if (!requireNamespace("shinyjs", quietly = TRUE)) {
     stop("Package \"shinyjs\" required.", call. = FALSE)
   }
 
   shiny::insertUI(
-    selector = "head",
-    where = "beforeEnd",
-    immediate = TRUE,
+    selector = "head", where = "beforeEnd", immediate = TRUE,
     ui = shinyjs::useShinyjs()
   )
   url <- logout_url()
diff --git a/R/shiny.R b/R/shiny.R
index fede422..081825e 100644
--- a/R/shiny.R
+++ b/R/shiny.R
@@ -14,6 +14,7 @@
 #' # first, create the yml file using use_auth0() function
 #'
 #' if (interactive()) {
+#'
 #'   # ui.R file
 #'   library(shiny)
 #'   library(auth0)
@@ -27,6 +28,7 @@
 #'   options(shiny.port = 8080)
 #'   shiny::runApp()
 #' }
+#'
 #' }
 #' @export
 auth0_ui <- function(ui, info) {
@@ -36,53 +38,39 @@ auth0_ui <- function(ui, info) {
   } else {
     if (missing(info)) info <- auth0_info()
     function(req) {
-      verify <- has_auth_code(
-        shiny::parseQueryString(req$QUERY_STRING),
-        info$state
-      )
+      verify <- has_auth_code(shiny::parseQueryString(req$QUERY_STRING), info$state)
       if (!verify) {
         if (grepl("error=unauthorized", req$QUERY_STRING)) {
           redirect <- sprintf("location.replace(\"%s\");", logout_url())
           shiny::tags$script(shiny::HTML(redirect))
         } else {
+
           params <- shiny::parseQueryString(req$QUERY_STRING)
           params$code <- NULL
           params$state <- NULL
 
-          # Reconstruct the query string
-          query <- paste(
+          query_params <- paste(
             mapply(paste, names(params), params, MoreArgs = list(sep = "=")),
-            collapse = "&"
-          )
-          query <- if (query != "") paste0("?", query) else ""
-
-          # Preserve the original path (req$PATH_INFO) in the redirect URI
-          if (grepl("127.0.0.1", req$HTTP_HOST)) {
-            redirect_uri <- paste0(
-              "http://",
-              gsub("127.0.0.1", "localhost", req$HTTP_HOST),
-              req$PATH_INFO,
-              query
-            )
+            collapse = "&")
+          query <- if (query_params != "") paste0("/?", query_params) else "/"
+          if (!is.null(info$remote_url) && info$remote_url != "" && !getOption("auth0_local")) {
+            redirect_uri <- paste0(info$remote_url, query)
           } else {
-            redirect_uri <- paste0(
-              "http://",
-              req$HTTP_HOST,
-              req$PATH_INFO,
-              query
-            )
+            if (grepl("127.0.0.1", req$HTTP_HOST)) {
+              redirect_uri <- paste0("http://", gsub("127.0.0.1", "localhost", req$HTTP_HOST), query)
+            } else {
+              redirect_uri <- paste0("http://", req$HTTP_HOST, query)
+            }
           }
           redirect_uri <<- redirect_uri
-
-          # Generate the Auth0 authorization URL
-          query_extra <- if (is.null(info$audience)) list() else
-            list(audience = info$audience)
+          query_extra <- if(!is.null(info$audience) || !is.null(info$extra_params)) {
+            c(info$extra_params, list(audience = info$audience))
+          } else {
+            NULL
+          }
           url <- httr::oauth2.0_authorize_url(
-            info$api,
-            info$app(redirect_uri),
-            scope = info$scope,
-            state = info$state,
-            query_extra = query_extra
+            info$api, info$app(redirect_uri), scope = info$scope, state = info$state,
+            query_extra=query_extra
           )
           redirect <- sprintf("location.replace(\"%s\");", url)
           shiny::tags$script(shiny::HTML(redirect))
@@ -103,21 +91,20 @@ auth0_ui <- function(ui, info) {
 #' @param server the shiny server function.
 #' @param info object returned from [auth0_info]. If not informed,
 #'   will try to find the `_auth0.yml` and create it automatically.
+#' @param remove_callback_params whether to remove the `code` and `state` query.
 #'
 #' @export
-auth0_server <- function(server, info) {
+auth0_server <- function(server, info, remove_callback_params = TRUE) {
   disable <- getOption("auth0_disable")
   if (!is.null(disable) && disable) {
     server
   } else {
     if (missing(info)) info <- auth0_info()
     function(input, output, session) {
-      shiny::isolate(auth0_server_verify(
-        session,
-        info$app,
-        info$api,
-        info$state
-      ))
+      shiny::isolate(auth0_server_verify(session, info$app, info$api, info$state))
+      if (remove_callback_params) {
+        auth0_remove_callback_params(session)
+      }
       shiny::observeEvent(input[["._auth0logout_"]], logout())
       server(input, output, session)
     }
@@ -132,6 +119,8 @@ auth0_server <- function(server, info) {
 #' @param ui an ordinary UI object to create shiny apps.
 #' @param server an ordinary server object to create shiny apps.
 #' @param config_file path to YAML configuration file.
+#' @param remove_callback_params whether to remove the `code` and `state` query 
+#' parameters from the URL after successful authentication. Defaults to `TRUE`.
 #' @param ... Other arguments passed on to [shiny::shinyApp()].
 #'
 #' @details
@@ -147,7 +136,8 @@ auth0_server <- function(server, info) {
 #'   disable auth0 temporarily.
 #'
 #' @export
-shinyAppAuth0 <- function(ui, server, config_file = NULL, ...) {
+shinyAppAuth0 <- function(ui, server, config_file = NULL, remove_callback_params = TRUE, ...) {
+
   disable <- getOption("auth0_disable")
   if (!is.null(disable) && disable) {
     shiny::shinyApp(ui, server, ...)
@@ -156,7 +146,11 @@ shinyAppAuth0 <- function(ui, server, config_file = NULL, ...) {
       config_file <- auth0_find_config_file()
     }
     info <- auth0_info(config_file)
-    shiny::shinyApp(auth0_ui(ui, info), auth0_server(server, info), ...)
+    shiny::shinyApp(
+      auth0_ui(ui, info), 
+      auth0_server(server, info, remove_callback_params), 
+      ...
+    )
   }
 }
 
@@ -171,10 +165,8 @@ shinyAppAuth0 <- function(ui, server, config_file = NULL, ...) {
 #'
 #' @export
 shinyAuth0App <- function(ui, server, config_file = NULL) {
-  warning(
-    "`shinyAuth0App()` is soft-deprecated as of auth0 0.1.2.",
-    "Please use `shinyAppAuth0()` instead."
-  )
+  warning("`shinyAuth0App()` is soft-deprecated as of auth0 0.1.2.",
+          "Please use `shinyAppAuth0()` instead.")
   shinyAppAuth0(ui, server, config_file)
 }
 
@@ -221,12 +213,14 @@ shinyAuth0App <- function(ui, server, config_file = NULL) {
 #'   }
 #'   shinyAuth0App(ui, server, config_file)
 #' }
+#'
 #' }
 #'
+#'
 #' @export
 auth0_logout_url <- function(config_file = NULL, redirect_js = TRUE) {
-  stop(
-    "`auth0_logout_url()` is deprecated. ",
-    "See `?logoutButton()` to add a logout button in auth0 apps."
-  )
+
+  stop("`auth0_logout_url()` is deprecated. ",
+       "See `?logoutButton()` to add a logout button in auth0 apps.")
+
 }
diff --git a/R/utils.R b/R/utils.R
index 8fe26bb..f244158 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -6,7 +6,7 @@
     auth0_local = interactive()
   )
   toset <- !(names(op.auth0) %in% names(op))
-  if(any(toset)) options(op.auth0[toset])
+  if (any(toset)) options(op.auth0[toset])
   invisible()
 }
 
@@ -24,7 +24,6 @@
 #'
 #' @export
 auth0_find_config_file <- function() {
-
   config_file <- getOption("auth0_config_file")
 
   if (is.null(config_file) || !file.exists(config_file)) {
@@ -51,5 +50,44 @@ auth0_find_config_file <- function() {
   config_file
 }
 
+auth0_remove_callback_params <- function(session) {
+  shiny::observeEvent(session[["clientData"]]$url_search,
+    {
+      params <- shiny::parseQueryString(session[["clientData"]]$url_search)
+
+      # Remove only auth callback params and keep any other query params untouched.
+      if (!is.null(params$code) || !is.null(params$state)) {
+        params$code <- NULL
+        params$state <- NULL
+
+        path <- session[["clientData"]]$url_pathname
+        hash <- session[["clientData"]]$url_hash
+
+        query <- ""
+        if (length(params) > 0) {
+          encoded <- mapply(
+            function(nm, val) {
+              paste0(
+                utils::URLencode(nm, reserved = TRUE),
+                "=",
+                utils::URLencode(as.character(val), reserved = TRUE)
+              )
+            },
+            names(params),
+            params,
+            SIMPLIFY = TRUE,
+            USE.NAMES = FALSE
+          )
+          query <- paste0("?", paste(encoded, collapse = "&"))
+        }
+
+        shiny::updateQueryString(paste0(path, query, hash), mode = "replace", session = session)
+      }
+    },
+    once = TRUE,
+    ignoreInit = FALSE
+  )
+}
+
 # Get rid of NOTE
 globalVariables(c("redirect_uri"))
diff --git a/man/auth0_logout_url.Rd b/man/auth0_logout_url.Rd
index 2227d5b..73a9c00 100644
--- a/man/auth0_logout_url.Rd
+++ b/man/auth0_logout_url.Rd
@@ -50,6 +50,8 @@ if (interactive()) {
   }
   shinyAuth0App(ui, server, config_file)
 }
+
 }
 
+
 }
diff --git a/man/shinyAppAuth0.Rd b/man/shinyAppAuth0.Rd
index 80167fc..7aa9927 100644
--- a/man/shinyAppAuth0.Rd
+++ b/man/shinyAppAuth0.Rd
@@ -4,7 +4,13 @@
 \alias{shinyAppAuth0}
 \title{Create a Shiny app object with Auth0 Authentication}
 \usage{
-shinyAppAuth0(ui, server, config_file = NULL, ...)
+shinyAppAuth0(
+  ui,
+  server,
+  config_file = NULL,
+  remove_callback_params = TRUE,
+  ...
+)
 }
 \arguments{
 \item{ui}{an ordinary UI object to create shiny apps.}
@@ -13,6 +19,9 @@ shinyAppAuth0(ui, server, config_file = NULL, ...)
 
 \item{config_file}{path to YAML configuration file.}
 
+\item{remove_callback_params}{whether to remove the \code{code} and \code{state} query
+parameters from the URL after successful authentication. Defaults to \code{TRUE}.}
+
 \item{...}{Other arguments passed on to \code{\link[shiny:shinyApp]{shiny::shinyApp()}}.}
 }
 \description{
diff --git a/man/ui-server.Rd b/man/ui-server.Rd
index ed8fae1..dc062f5 100644
--- a/man/ui-server.Rd
+++ b/man/ui-server.Rd
@@ -8,7 +8,7 @@
 \usage{
 auth0_ui(ui, info)
 
-auth0_server(server, info)
+auth0_server(server, info, remove_callback_params = TRUE)
 }
 \arguments{
 \item{ui}{\code{shiny.tag.list} object to generate the user interface.}
@@ -17,6 +17,8 @@ auth0_server(server, info)
 will try to find the \verb{_auth0.yml} and create it automatically.}
 
 \item{server}{the shiny server function.}
+
+\item{remove_callback_params}{whether to remove the \code{code} and \code{state} query.}
 }
 \description{
 These functions can be used in a ui.R/server.R framework, modifying the
@@ -27,6 +29,7 @@ shiny objects to authenticate using Auth0 service with no pain.
 # first, create the yml file using use_auth0() function
 
 if (interactive()) {
+
   # ui.R file
   library(shiny)
   library(auth0)
@@ -40,6 +43,7 @@ if (interactive()) {
   options(shiny.port = 8080)
   shiny::runApp()
 }
+
 }
 }
 \seealso{