diff --git a/src/mastodon-cpp.cpp b/src/mastodon-cpp.cpp
index 85123d2..986d27c 100644
--- a/src/mastodon-cpp.cpp
+++ b/src/mastodon-cpp.cpp
@@ -134,6 +134,17 @@ const std::uint16_t API::register_app1(const string &instance,
                                        string &client_id,
                                        string &client_secret,
                                        string &url)
+{
+    register_app1(client_name, redirect_uri, scopes, website,
+                  client_id, client_secret, url);
+}
+const std::uint16_t API::register_app1(const string &client_name,
+                                       const string &redirect_uri,
+                                       const string &scopes,
+                                       const string &website,
+                                       string &client_id,
+                                       string &client_secret,
+                                       string &url)
 {
     API::parametermap parameters =
     {
@@ -157,7 +168,7 @@ const std::uint16_t API::register_app1(const string &instance,
         std::regex_search(answer, match, resecret);
         client_secret = match[1].str();
 
-        url = "https://" + instance + "/oauth/authorize" +
+        url = "https://" + _instance + "/oauth/authorize" +
               "?scope=" + curlpp::escape(scopes) + "&response_type=code" +
               "&redirect_uri=" + curlpp::escape(redirect_uri) +
               "&client_id=" + client_id;
@@ -187,6 +198,15 @@ const std::uint16_t API::register_app2(const string &instance,
                                        const string &redirect_uri,
                                        const string &code,
                                        string &access_token)
+{
+    register_app2(client_id, client_secret, redirect_uri, code, access_token);
+}
+
+const std::uint16_t API::register_app2(const string &client_id,
+                                       const string &client_secret,
+                                       const string &redirect_uri,
+                                       const string &code,
+                                       string &access_token)
 {
     API::parametermap parameters =
     {
diff --git a/src/mastodon-cpp.hpp b/src/mastodon-cpp.hpp
index f499b4a..85c0af6 100644
--- a/src/mastodon-cpp.hpp
+++ b/src/mastodon-cpp.hpp
@@ -250,7 +250,6 @@ public:
     /*!
      *  @brief  Register application, step 1/2
      *
-     *  @param  instance       
      *  @param  client_name    The name of the application
      *  @param  redirect_uri   urn:ietf:wg:oauth:2.0:oob for none
      *  @param  scopes         Scopes (read, write, follow, space separated)
@@ -262,6 +261,17 @@ public:
      *  @return @ref error "Error code". If the URL has permanently changed, 3
      *  is returned and url is set to the new URL.
      */
+    const std::uint16_t register_app1(const std::string &client_name,
+                                      const std::string &redirect_uri,
+                                      const std::string &scopes,
+                                      const std::string &website,
+                                      std::string &client_id,
+                                      std::string &client_secret,
+                                      std::string &url);
+
+    /*!
+     *  @deprecated Will vanish in 0.5.0
+     */
     const std::uint16_t register_app1(const std::string &instance,
                                       const std::string &client_name,
                                       const std::string &redirect_uri,
@@ -276,7 +286,6 @@ public:
      *  
      *          The access token will be used in all subsequent calls.
      *
-     *  @param  instance       
      *  @param  client_id      
      *  @param  client_secret  
      *  @param  redirect_uri   urn:ietf:wg:oauth:2.0:oob for none
@@ -285,6 +294,15 @@ public:
      *
      *  @return @ref error "Error code".
      */
+    const std::uint16_t register_app2(const std::string &client_id,
+                                      const std::string &client_secret,
+                                      const std::string &redirect_uri,
+                                      const std::string &code,
+                                      std::string &access_token);
+
+    /*!
+     *  @deprecated Will vanish in 0.5.0
+     */
     const std::uint16_t register_app2(const std::string &instance,
                                       const std::string &client_id,
                                       const std::string &client_secret,