diff --git a/examples/secret_bot.php b/examples/secret_bot.php
index 4527c5c3..c616832b 100755
--- a/examples/secret_bot.php
+++ b/examples/secret_bot.php
@@ -134,7 +134,7 @@ if (\file_exists('.env')) {
 echo 'Loading settings...'.PHP_EOL;
 $settings = \json_decode(\getenv('MTPROTO_SETTINGS'), true) ?: [];
 
-$MadelineProto = new \danog\MadelineProto\API('s.madeline', $settings);
+$MadelineProto = new \danog\MadelineProto\API('secret.madeline', $settings);
 
 // Reduce boilerplate with new wrapper method
 $MadelineProto->startAndLoop(SecretHandler::class);
diff --git a/src/danog/MadelineProto/Connection.php b/src/danog/MadelineProto/Connection.php
index b966be95..c84caeaf 100644
--- a/src/danog/MadelineProto/Connection.php
+++ b/src/danog/MadelineProto/Connection.php
@@ -360,35 +360,94 @@ class Connection
             $this->pinger->start();
         }
     }
+    /**
+     * Apply method abstractions.
+     *
+     * @param string $method    Method name
+     * @param array  $arguments Arguments
+     *
+     * @return \Generator Whether we need to resolve a queue promise
+     */
+    private function methodAbstractions(string &$method, array &$arguments): \Generator
+    {
+        if ($method === 'messages.importChatInvite' && isset($arguments['hash']) && \is_string($arguments['hash']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/(joinchat/)?([a-z0-9_-]*)@i', $arguments['hash'], $matches)) {
+            if ($matches[1] === '') {
+                $method = 'channels.joinChannel';
+                $arguments['channel'] = $matches[2];
+            } else {
+                $arguments['hash'] = $matches[2];
+            }
+        } elseif ($method === 'messages.checkChatInvite' && isset($arguments['hash']) && \is_string($arguments['hash']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/joinchat/([a-z0-9_-]*)@i', $arguments['hash'], $matches)) {
+            $arguments['hash'] = $matches[1];
+        } elseif ($method === 'channels.joinChannel' && isset($arguments['channel']) && \is_string($arguments['channel']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/(joinchat/)?([a-z0-9_-]*)@i', $arguments['channel'], $matches)) {
+            if ($matches[1] !== '') {
+                $method = 'messages.importChatInvite';
+                $arguments['hash'] = $matches[2];
+            }
+        } elseif ($method === 'messages.sendMessage' && isset($arguments['peer']['_']) && \in_array($arguments['peer']['_'], ['inputEncryptedChat', 'updateEncryption', 'updateEncryptedChatTyping', 'updateEncryptedMessagesRead', 'updateNewEncryptedMessage', 'encryptedMessage', 'encryptedMessageService'])) {
+            $method = 'messages.sendEncrypted';
+            $arguments = ['peer' => $arguments['peer'], 'message' => $arguments];
+            if (!isset($arguments['message']['_'])) {
+                $arguments['message']['_'] = 'decryptedMessage';
+            }
+            if (!isset($arguments['message']['ttl'])) {
+                $arguments['message']['ttl'] = 0;
+            }
+            if (isset($arguments['message']['reply_to_msg_id'])) {
+                $arguments['message']['reply_to_random_id'] = $arguments['message']['reply_to_msg_id'];
+            }
+        } elseif ($method === 'messages.sendEncryptedFile') {
+            if (isset($arguments['file'])) {
+                if ((!\is_array($arguments['file']) || !(isset($arguments['file']['_']) && $this->API->getTL()->getConstructors()->findByPredicate($arguments['file']['_']) === 'InputEncryptedFile')) && $this->API->getSettings()->getFiles()->getAllowAutomaticUpload()) {
+                    $arguments['file'] = (yield from $this->API->uploadEncrypted($arguments['file']));
+                }
+                if (isset($arguments['file']['key'])) {
+                    $arguments['message']['media']['key'] = $arguments['file']['key'];
+                }
+                if (isset($arguments['file']['iv'])) {
+                    $arguments['message']['media']['iv'] = $arguments['file']['iv'];
+                }
+            }
+            $arguments['queuePromise'] = new Deferred;
+            return $arguments['queuePromise'];
+        } elseif (\in_array($method, ['messages.addChatUser', 'messages.deleteChatUser', 'messages.editChatAdmin', 'messages.editChatPhoto', 'messages.editChatTitle', 'messages.getFullChat', 'messages.exportChatInvite', 'messages.editChatAdmin', 'messages.migrateChat']) && isset($arguments['chat_id']) && (!\is_numeric($arguments['chat_id']) || $arguments['chat_id'] < 0)) {
+            $res = (yield from $this->API->getInfo($arguments['chat_id']));
+            if ($res['type'] !== 'chat') {
+                throw new \danog\MadelineProto\Exception('chat_id is not a chat id (only normal groups allowed, not supergroups)!');
+            }
+            $arguments['chat_id'] = $res['chat_id'];
+        } elseif ($method === 'photos.updateProfilePhoto') {
+            if (isset($arguments['id'])) {
+                if (!\is_array($arguments['id'])) {
+                    $method = 'photos.uploadProfilePhoto';
+                    $arguments['file'] = $arguments['id'];
+                }
+            } elseif (isset($arguments['file'])) {
+                $method = 'photos.uploadProfilePhoto';
+            }
+        } elseif ($method === 'photos.uploadProfilePhoto') {
+            if (isset($arguments['file'])) {
+                if (\is_array($arguments['file']) && !\in_array($arguments['file']['_'], ['inputFile', 'inputFileBig'])) {
+                    $method = 'photos.uploadProfilePhoto';
+                    $arguments['id'] = $arguments['file'];
+                }
+            } elseif (isset($arguments['id'])) {
+                $method = 'photos.updateProfilePhoto';
+            }
+        } elseif ($method === 'messages.uploadMedia') {
+            if (!isset($arguments['peer']) && !$this->API->getSelf()['bot']) {
+                $arguments['peer'] = 'me';
+            }
+        }
+        if ($method === 'messages.sendEncrypted' || $method === 'messages.sendEncryptedService') {
+            $arguments['queuePromise'] = new Deferred;
+            return $arguments['queuePromise'];
+        }
+        return null;
+    }
     /**
      * Send an MTProto message.
      *
-     * Structure of message array:
-     * [
-     *     // only in outgoing messages
-     *     'body' => deserialized body, (optional if container)
-     *     'serialized_body' => 'serialized body', (optional if container)
-     *     'contentRelated' => bool,
-     *     '_' => 'predicate',
-     *     'promise' => deferred promise that gets resolved when a response to the message is received (optional),
-     *     'send_promise' => deferred promise that gets resolved when the message is sent (optional),
-     *     'file' => bool (optional),
-     *     'type' => 'type' (optional),
-     *     'queue' => queue ID (optional),
-     *     'container' => [message ids] (optional),
-     *
-     *     // only in incoming messages
-     *     'content' => deserialized body,
-     *     'seq_no' => number (optional),
-     *     'from_container' => bool (optional),
-     *
-     *     // can be present in both
-     *     'response' => message id (optional),
-     *     'msg_id' => message id (optional),
-     *     'sent' => timestamp,
-     *     'tries' => number
-     * ]
-     *
      * @param OutgoingMessage $message The message to send
      * @param boolean         $flush   Whether to flush the message right away
      *
@@ -404,7 +463,9 @@ class Connection
                 $this->API->referenceDatabase->refreshNext(true);
             }
             if ($message->isMethod()) {
-                $body = yield from $this->API->getTL()->serializeMethod($message->getConstructor(), $body);
+                $method = $message->getConstructor();
+                $queuePromise = yield from $this->methodAbstractions($method, $body);
+                $body = yield from $this->API->getTL()->serializeMethod($method, $body);
             } else {
                 $body['_'] = $message->getConstructor();
                 $body = yield from $this->API->getTL()->serializeObject(['type' => ''], $body, $message->getConstructor());
@@ -416,6 +477,9 @@ class Connection
             unset($body);
         }
         $this->pendingOutgoing[$this->pendingOutgoingKey++] = $message;
+        if (isset($queuePromise)) {
+            $queuePromise->resolve();
+        }
         if ($flush && isset($this->writer)) {
             $this->writer->resume();
         }
diff --git a/src/danog/MadelineProto/SecretChats/MessageHandler.php b/src/danog/MadelineProto/SecretChats/MessageHandler.php
index 017a709e..afd26d3d 100644
--- a/src/danog/MadelineProto/SecretChats/MessageHandler.php
+++ b/src/danog/MadelineProto/SecretChats/MessageHandler.php
@@ -19,6 +19,8 @@
 
 namespace danog\MadelineProto\SecretChats;
 
+use Amp\Deferred;
+use Amp\Promise;
 use danog\MadelineProto\MTProtoTools\Crypt;
 
 /**
@@ -26,17 +28,24 @@ use danog\MadelineProto\MTProtoTools\Crypt;
  */
 trait MessageHandler
 {
+    /**
+     * Secret queue.
+     *
+     * @var Promise[]
+     */
+    private $secretQueue = [];
     /**
      * Encrypt secret chat message.
      *
-     * @param integer $chat_id Chat ID
-     * @param array   $message Message to encrypt
+     * @param integer  $chat_id      Chat ID
+     * @param array    $message      Message to encrypt
+     * @param Deferred $queuePromise Queue promise
      *
      * @internal
      *
      * @return \Generator
      */
-    public function encryptSecretMessage(int $chat_id, array $message): \Generator
+    public function encryptSecretMessage(int $chat_id, array $message, Deferred $queuePromise): \Generator
     {
         if (!isset($this->secret_chats[$chat_id])) {
             $this->logger->logger(\sprintf(\danog\MadelineProto\Lang::$current_lang['secret_chat_skipping'], $chat_id));
@@ -48,6 +57,13 @@ trait MessageHandler
             if (($this->secret_chats[$chat_id]['ttr'] <= 0 || \time() - $this->secret_chats[$chat_id]['updated'] > 7 * 24 * 60 * 60) && $this->secret_chats[$chat_id]['rekeying'][0] === 0) {
                 yield from $this->rekey($chat_id);
             }
+            if (isset($this->secretQueue[$chat_id])) {
+                $promise = $this->secretQueue[$chat_id];
+                $this->secretQueue[$chat_id] = $queuePromise->promise();
+                yield $promise;
+            } else {
+                $this->secretQueue[$chat_id] = $queuePromise->promise();
+            }
             $message = ['_' => 'decryptedMessageLayer', 'layer' => $this->secret_chats[$chat_id]['layer'], 'in_seq_no' => $this->generateSecretInSeqNo($chat_id), 'out_seq_no' => $this->generateSecretOutSeqNo($chat_id), 'message' => $message];
             $this->secret_chats[$chat_id]['out_seq_no']++;
         }
diff --git a/src/danog/MadelineProto/TL/TL.php b/src/danog/MadelineProto/TL/TL.php
index 4de07d49..8dfc20c2 100644
--- a/src/danog/MadelineProto/TL/TL.php
+++ b/src/danog/MadelineProto/TL/TL.php
@@ -520,7 +520,7 @@ class TL
                 $concat = $this->constructors->findByPredicate('vector')['id'];
                 $concat .= \danog\MadelineProto\Tools::packUnsignedInt(\count($object));
                 foreach ($object as $k => $current_object) {
-                    $concat .= (yield from $this->serializeObject(['type' => $type['subtype']], $current_object, $k));
+                    $concat .= (yield from $this->serializeObject(['type' => $type['subtype']], $current_object, $k, $layer));
                 }
                 return $concat;
             case 'vector':
@@ -529,7 +529,7 @@ class TL
                 }
                 $concat = \danog\MadelineProto\Tools::packUnsignedInt(\count($object));
                 foreach ($object as $k => $current_object) {
-                    $concat .= (yield from $this->serializeObject(['type' => $type['subtype']], $current_object, $k));
+                    $concat .= (yield from $this->serializeObject(['type' => $type['subtype']], $current_object, $k, $layer));
                 }
                 return $concat;
             case 'Object':
@@ -574,7 +574,7 @@ class TL
             $constructorData = $this->constructors->findByPredicate('inputMessageEntityMentionName');
         }
         $concat = $bare ? '' : $constructorData['id'];
-        return $concat.(yield from $this->serializeParams($constructorData, $object, '', $layer));
+        return $concat.(yield from $this->serializeParams($constructorData, $object, '', $layer, null));
     }
     /**
      * Serialize method.
@@ -588,78 +588,11 @@ class TL
      */
     public function serializeMethod(string $method, $arguments): \Generator
     {
-        if ($method === 'messages.importChatInvite' && isset($arguments['hash']) && \is_string($arguments['hash']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/(joinchat/)?([a-z0-9_-]*)@i', $arguments['hash'], $matches)) {
-            if ($matches[1] === '') {
-                $method = 'channels.joinChannel';
-                $arguments['channel'] = $matches[2];
-            } else {
-                $arguments['hash'] = $matches[2];
-            }
-        } elseif ($method === 'messages.checkChatInvite' && isset($arguments['hash']) && \is_string($arguments['hash']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/joinchat/([a-z0-9_-]*)@i', $arguments['hash'], $matches)) {
-            $arguments['hash'] = $matches[1];
-        } elseif ($method === 'channels.joinChannel' && isset($arguments['channel']) && \is_string($arguments['channel']) && \preg_match('@(?:t|telegram)\\.(?:me|dog)/(joinchat/)?([a-z0-9_-]*)@i', $arguments['channel'], $matches)) {
-            if ($matches[1] !== '') {
-                $method = 'messages.importChatInvite';
-                $arguments['hash'] = $matches[2];
-            }
-        } elseif ($method === 'messages.sendMessage' && isset($arguments['peer']['_']) && \in_array($arguments['peer']['_'], ['inputEncryptedChat', 'updateEncryption', 'updateEncryptedChatTyping', 'updateEncryptedMessagesRead', 'updateNewEncryptedMessage', 'encryptedMessage', 'encryptedMessageService'])) {
-            $method = 'messages.sendEncrypted';
-            $arguments = ['peer' => $arguments['peer'], 'message' => $arguments];
-            if (!isset($arguments['message']['_'])) {
-                $arguments['message']['_'] = 'decryptedMessage';
-            }
-            if (!isset($arguments['message']['ttl'])) {
-                $arguments['message']['ttl'] = 0;
-            }
-            if (isset($arguments['message']['reply_to_msg_id'])) {
-                $arguments['message']['reply_to_random_id'] = $arguments['message']['reply_to_msg_id'];
-            }
-        } elseif ($method === 'messages.sendEncryptedFile') {
-            if (isset($arguments['file'])) {
-                if ((!\is_array($arguments['file']) || !(isset($arguments['file']['_']) && $this->constructors->findByPredicate($arguments['file']['_']) === 'InputEncryptedFile')) && $this->API->getSettings()->getFiles()->getAllowAutomaticUpload()) {
-                    $arguments['file'] = (yield from $this->API->uploadEncrypted($arguments['file']));
-                }
-                if (isset($arguments['file']['key'])) {
-                    $arguments['message']['media']['key'] = $arguments['file']['key'];
-                }
-                if (isset($arguments['file']['iv'])) {
-                    $arguments['message']['media']['iv'] = $arguments['file']['iv'];
-                }
-            }
-        } elseif (\in_array($method, ['messages.addChatUser', 'messages.deleteChatUser', 'messages.editChatAdmin', 'messages.editChatPhoto', 'messages.editChatTitle', 'messages.getFullChat', 'messages.exportChatInvite', 'messages.editChatAdmin', 'messages.migrateChat']) && isset($arguments['chat_id']) && (!\is_numeric($arguments['chat_id']) || $arguments['chat_id'] < 0)) {
-            $res = (yield from $this->API->getInfo($arguments['chat_id']));
-            if ($res['type'] !== 'chat') {
-                throw new \danog\MadelineProto\Exception('chat_id is not a chat id (only normal groups allowed, not supergroups)!');
-            }
-            $arguments['chat_id'] = $res['chat_id'];
-        } elseif ($method === 'photos.updateProfilePhoto') {
-            if (isset($arguments['id'])) {
-                if (!\is_array($arguments['id'])) {
-                    $method = 'photos.uploadProfilePhoto';
-                    $arguments['file'] = $arguments['id'];
-                }
-            } elseif (isset($arguments['file'])) {
-                $method = 'photos.uploadProfilePhoto';
-            }
-        } elseif ($method === 'photos.uploadProfilePhoto') {
-            if (isset($arguments['file'])) {
-                if (\is_array($arguments['file']) && !\in_array($arguments['file']['_'], ['inputFile', 'inputFileBig'])) {
-                    $method = 'photos.uploadProfilePhoto';
-                    $arguments['id'] = $arguments['file'];
-                }
-            } elseif (isset($arguments['id'])) {
-                $method = 'photos.updateProfilePhoto';
-            }
-        } elseif ($method === 'messages.uploadMedia') {
-            if (!isset($arguments['peer']) && !$this->API->getSelf()['bot']) {
-                $arguments['peer'] = 'me';
-            }
-        }
         $tl = $this->methods->findByMethod($method);
         if ($tl === false) {
             throw new Exception(\danog\MadelineProto\Lang::$current_lang['method_not_found'].$method);
         }
-        return $tl['id'].(yield from $this->serializeParams($tl, $arguments, $method));
+        return $tl['id'].(yield from $this->serializeParams($tl, $arguments, $method, -1, $arguments['queuePromise'] ?? null));
     }
     /**
      * Serialize parameters.
@@ -673,7 +606,7 @@ class TL
      *
      * @psalm-return \Generator<int|mixed, Promise|Promise<\Amp\File\File>|Promise<\Amp\Ipc\Sync\ChannelledSocket>|Promise<int>|Promise<mixed>|Promise<null|string>|\danog\MadelineProto\Stream\StreamInterface|array|int|mixed, mixed, string>
      */
-    private function serializeParams(array $tl, $arguments, $ctx, int $layer = -1): \Generator
+    private function serializeParams(array $tl, $arguments, $ctx, int $layer, $promise): \Generator
     {
         $serialized = '';
         $arguments = (yield from $this->API->botAPIToMTProto($arguments));
@@ -706,11 +639,11 @@ class TL
                     continue;
                 }
                 if ($current_argument['name'] === 'random_bytes') {
-                    $serialized .= (yield from $this->serializeObject(['type' => 'bytes'], \danog\MadelineProto\Tools::random(15 + 4 * \danog\MadelineProto\Tools::randomInt($modulus = 3)), 'random_bytes'));
+                    $serialized .= yield from $this->serializeObject(['type' => 'bytes'], \danog\MadelineProto\Tools::random(15 + 4 * \danog\MadelineProto\Tools::randomInt($modulus = 3)), 'random_bytes');
                     continue;
                 }
                 if ($current_argument['name'] === 'data' && isset($tl['method']) && \in_array($tl['method'], ['messages.sendEncrypted', 'messages.sendEncryptedFile', 'messages.sendEncryptedService']) && isset($arguments['message'])) {
-                    $serialized .= (yield from $this->serializeObject($current_argument, yield from $this->API->encryptSecretMessage($arguments['peer']['chat_id'], $arguments['message']), 'data'));
+                    $serialized .= yield from $this->serializeObject($current_argument, yield from $this->API->encryptSecretMessage($arguments['peer']['chat_id'], $arguments['message'], $promise), 'data');
                     continue;
                 }
                 if ($current_argument['name'] === 'random_id') {