diff --git a/CHANGELOG.md b/CHANGELOG.md
index abff925ce9..54fec73005 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,17 @@
 * `UpdatesFilter` and other objects now work with `UpdateReceiver<Update>` as common supertype
 for receivers.
 
+### 0.12.3 Cleaning
+
+* Refactor, optimizing and cleaning of code
+* Removed deprecated method `T#toJsonWithoutNulls()`
+* Renamed instances of `MediaGroupMessage`s and refactored their interfaces. `ChannelMediaGroupMessage`
+will not contain `user` field (but `CommonMediaGroupMessage` will have)
+* Now `MediaCollectionContent` is `MediaContent` (classes of this interface must choose best
+media for present out)
+    * `PhotoContent` now choose biggest photo size from its collection as `media`
+* Fix in order of media group messages which was received by webhooks
+
 ## 0.11.0
 
 * Kotlin `1.3.11` -> `1.3.21`
diff --git a/build.gradle b/build.gradle
index ce0d1adb5c..d5c823b65a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,4 +1,4 @@
-project.version = "0.12.2"
+project.version = "0.12.3"
 project.group = "com.github.insanusmokrassar"
 
 buildscript {
diff --git a/gradle.properties b/gradle.properties
index 30d76e621e..20f62f9d7f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -7,4 +7,7 @@ ktor_version=1.1.2
 
 gradle_bintray_plugin_version=1.8.4
 
+project_public_name=Telegram Bot API
+project_public_description=It is one more project which wish to be useful and full Telegram Bots API bridge for Kotlin
+
 disableImplicitReflectionSerializerAnnotation=-Xexperimental=kotlinx.serialization.ImplicitReflectionSerializer
diff --git a/maven.publish.gradle b/maven.publish.gradle
index 1c3ce7ee3b..f0237c2947 100644
--- a/maven.publish.gradle
+++ b/maven.publish.gradle
@@ -1,26 +1,6 @@
 apply plugin: 'maven-publish'
 apply plugin: 'signing'
 
-def pomConfig = {
-    licenses {
-        license {
-            name "The Apache Software License, Version 2.0"
-            url "http://www.apache.org/licenses/LICENSE-2.0.txt"
-            distribution "repo"
-        }
-    }
-    developers {
-        developer {
-            name "Ovsiannikov Aleksei"
-            email "ovsyannikov.alexey95@gmail.com"
-        }
-    }
-
-    scm {
-        url "https://github.com/InsanusMokrassar/${project.name}"
-    }
-}
-
 task sourcesJar(type: Jar) {
     from sourceSets.main.allSource
     classifier = 'sources'
@@ -45,8 +25,8 @@ publishing {
             pom.withXml {
                 asNode().children().last() + {
                     resolveStrategy = Closure.DELEGATE_FIRST
-                    name 'Telegram Bot API'
-                    description 'It is one more project which wish to be useful and full Telegram Bots API bridge for Kotlin'
+                    name "${project_public_name}"
+                    description "${project_public_description}"
                     url "https://insanusmokrassar.github.io/${project.name}"
 
                     scm {
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/MultipartRequestCallFactory.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/MultipartRequestCallFactory.kt
index b4b992ab7f..e7c16717e7 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/MultipartRequestCallFactory.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/MultipartRequestCallFactory.kt
@@ -11,10 +11,8 @@ import io.ktor.client.request.forms.MultiPartFormDataContent
 import io.ktor.client.request.forms.formData
 import io.ktor.client.request.url
 import io.ktor.http.*
-import kotlinx.serialization.ImplicitReflectionSerializer
 
 class MultipartRequestCallFactory : KtorCallFactory {
-    @ImplicitReflectionSerializer
     override suspend fun <T: Any> prepareCall(
         client: HttpClient,
         baseUrl: String,
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/SimpleRequestCallFactory.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/SimpleRequestCallFactory.kt
index 48b4d7e21a..3e91948a34 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/SimpleRequestCallFactory.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/bot/Ktor/base/SimpleRequestCallFactory.kt
@@ -11,10 +11,8 @@ import io.ktor.client.request.url
 import io.ktor.http.ContentType
 import io.ktor.http.HttpMethod
 import io.ktor.http.content.TextContent
-import kotlinx.serialization.ImplicitReflectionSerializer
 
 class SimpleRequestCallFactory : KtorCallFactory {
-    @ImplicitReflectionSerializer
     override suspend fun <T: Any> prepareCall(
         client: HttpClient,
         baseUrl: String,
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/common/CommonMultipartFileRequest.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/common/CommonMultipartFileRequest.kt
index efa5240cbd..be59fe4131 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/common/CommonMultipartFileRequest.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/common/CommonMultipartFileRequest.kt
@@ -1,13 +1,11 @@
 package com.github.insanusmokrassar.TelegramBotAPI.requests.common
 
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.*
-import kotlinx.serialization.ImplicitReflectionSerializer
 import kotlinx.serialization.json.JsonObject
 
 data class CommonMultipartFileRequest<T: Any>(
     val data: Request<T>,
     override val mediaMap: Map<String, MultipartFile>
 ) : MultipartRequest<T>, Request<T> by data {
-    @ImplicitReflectionSerializer
     override val paramsJson: JsonObject = data.json()
 }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/send/media/base/MultipartRequestImpl.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/send/media/base/MultipartRequestImpl.kt
index bc5488a504..c00917c99a 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/send/media/base/MultipartRequestImpl.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/send/media/base/MultipartRequestImpl.kt
@@ -2,7 +2,6 @@ package com.github.insanusmokrassar.TelegramBotAPI.requests.send.media.base
 
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.MultipartFile
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.MultipartRequest
-import kotlinx.serialization.ImplicitReflectionSerializer
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.JsonObject
 
@@ -15,7 +14,6 @@ class MultipartRequestImpl<D: DataRequest<R>, F: Files, R: Any>(
 ) : MultipartRequest<R> {
     override fun method(): String = data.method()
     override fun resultSerializer(): KSerializer<R> = data.resultSerializer()
-    @ImplicitReflectionSerializer
     override val paramsJson: JsonObject = data.json()
     override val mediaMap: Map<String, MultipartFile> = files
 }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/MediaGroupMessage.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/ChannelMediaGroupMessage.kt
similarity index 93%
rename from src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/MediaGroupMessage.kt
rename to src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/ChannelMediaGroupMessage.kt
index 904cda00d6..1a10980a8c 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/MediaGroupMessage.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/ChannelMediaGroupMessage.kt
@@ -8,7 +8,7 @@ import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.Messag
 import com.github.insanusmokrassar.TelegramBotAPI.types.message.content.abstracts.MediaGroupContent
 import org.joda.time.DateTime
 
-data class MediaGroupMessage(
+data class ChannelMediaGroupMessage(
     override val messageId: MessageIdentifier,
     override val chat: Chat,
     override val date: DateTime,
@@ -17,4 +17,4 @@ data class MediaGroupMessage(
     override val editDate: DateTime?,
     override val forwarded: ForwardedMessage?,
     override val replyTo: Message?
-) : Message, MediaGroupMessage
+) : MediaGroupMessage
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonMediaGroupMessage.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonMediaGroupMessage.kt
index 878dc837c4..736eba1fc9 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonMediaGroupMessage.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/CommonMediaGroupMessage.kt
@@ -3,7 +3,6 @@ package com.github.insanusmokrassar.TelegramBotAPI.types.message
 import com.github.insanusmokrassar.TelegramBotAPI.types.*
 import com.github.insanusmokrassar.TelegramBotAPI.types.chat.Chat
 import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.*
-import com.github.insanusmokrassar.TelegramBotAPI.types.message.abstracts.MediaGroupMessage
 import com.github.insanusmokrassar.TelegramBotAPI.types.message.content.abstracts.MediaGroupContent
 import org.joda.time.DateTime
 
@@ -17,4 +16,4 @@ data class CommonMediaGroupMessage(
     override val editDate: DateTime?,
     override val forwarded: ForwardedMessage?,
     override val replyTo: Message?
-) : Message, MediaGroupMessage, FromUserMessage
+) : MediaGroupMessage, FromUserMessage
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
index d42a935102..19b54b86d2 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/RawMessage.kt
@@ -210,7 +210,7 @@ data class RawMessage(
             content ->
             media_group_id ?.let {
                 when (from) {
-                    null -> MediaGroupMessage(
+                    null -> ChannelMediaGroupMessage(
                         messageId,
                         chat,
                         date.asDate,
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/abstracts/MediaCollectionContent.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/abstracts/MediaCollectionContent.kt
index a815289302..7e673c624b 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/abstracts/MediaCollectionContent.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/abstracts/MediaCollectionContent.kt
@@ -2,6 +2,6 @@ package com.github.insanusmokrassar.TelegramBotAPI.types.message.content.abstrac
 
 import com.github.insanusmokrassar.TelegramBotAPI.types.files.abstracts.TelegramMediaFile
 
-interface MediaCollectionContent<T: TelegramMediaFile>: MessageContent {
-    val media: List<T>
+interface MediaCollectionContent<T: TelegramMediaFile>: MessageContent, MediaContent<T> {
+    val mediaCollection: List<T>
 }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/media/PhotoContent.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/media/PhotoContent.kt
index 3a15314fb5..de31836ac8 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/media/PhotoContent.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/message/content/media/PhotoContent.kt
@@ -16,10 +16,12 @@ import com.github.insanusmokrassar.TelegramBotAPI.types.message.content.abstract
 import com.github.insanusmokrassar.TelegramBotAPI.utils.toMarkdownCaptions
 
 data class PhotoContent(
-    override val media: List<PhotoSize>,
+    override val mediaCollection: List<PhotoSize>,
     override val caption: String? = null,
     override val captionEntities: List<MessageEntity> = emptyList()
 ) : MediaCollectionContent<PhotoSize>, CaptionedMediaContent, MediaGroupContent {
+    override val media: PhotoSize = mediaCollection.biggest() ?: throw IllegalStateException("Can't locate any photo size for this content")
+
     override fun createResend(
         chatId: ChatIdentifier,
         disableNotification: Boolean,
@@ -27,7 +29,7 @@ data class PhotoContent(
         replyMarkup: KeyboardMarkup?
     ): Request<RawMessage> = SendPhoto(
         chatId,
-        media.biggest() ?.fileId ?: throw IllegalStateException("Empty list of media"),
+        media.fileId,
         toMarkdownCaptions().firstOrNull(),
         MarkdownParseMode,
         disableNotification,
@@ -36,7 +38,7 @@ data class PhotoContent(
     )
 
     override fun toMediaGroupMemberInputMedia(): MediaGroupMemberInputMedia = InputMediaPhoto(
-        media.biggest() ?.fileId ?: throw IllegalStateException("Can't locate any photo size for this content"),
+        media.fileId,
         toMarkdownCaptions().firstOrNull(),
         MarkdownParseMode
     )
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/BaseMessageUpdateToMediaGroupUpdate.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/BaseMessageUpdateToMediaGroupUpdate.kt
index e94d4af561..bf9ffd359e 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/BaseMessageUpdateToMediaGroupUpdate.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/BaseMessageUpdateToMediaGroupUpdate.kt
@@ -5,11 +5,12 @@ import com.github.insanusmokrassar.TelegramBotAPI.types.update.MediaGroupUpdates
 import com.github.insanusmokrassar.TelegramBotAPI.types.update.abstracts.BaseMessageUpdate
 
 fun List<BaseMessageUpdate>.toMediaGroupUpdate(): MediaGroupUpdate? = (this as? MediaGroupUpdate) ?: let {
+    val resultList = sortedBy { it.updateId }
     when (first()) {
-        is MessageUpdate -> MessageMediaGroupUpdate(this)
-        is EditMessageUpdate -> EditMessageMediaGroupUpdate(this)
-        is ChannelPostUpdate -> ChannelPostMediaGroupUpdate(this)
-        is EditChannelPostUpdate -> EditChannelPostMediaGroupUpdate(this)
+        is MessageUpdate -> MessageMediaGroupUpdate(resultList)
+        is EditMessageUpdate -> EditMessageMediaGroupUpdate(resultList)
+        is ChannelPostUpdate -> ChannelPostMediaGroupUpdate(resultList)
+        is EditChannelPostUpdate -> EditChannelPostMediaGroupUpdate(resultList)
         else -> null
     }
 }
diff --git a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/JSON.kt b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/JSON.kt
index e8c0583fac..9273319a5c 100644
--- a/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/JSON.kt
+++ b/src/main/kotlin/com/github/insanusmokrassar/TelegramBotAPI/utils/JSON.kt
@@ -1,15 +1,8 @@
 package com.github.insanusmokrassar.TelegramBotAPI.utils
 
-import kotlinx.serialization.ImplicitReflectionSerializer
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.*
 
-@Deprecated("This method can throw exceptions")
-@ImplicitReflectionSerializer
-inline fun <reified T: Any> T.toJsonWithoutNulls(): JsonObject = Json.nonstrict.toJson(
-    this
-).jsonObject.withoutNulls()
-
 inline fun <reified T: Any> T.toJsonWithoutNulls(serializer: KSerializer<T>): JsonObject = toJson(serializer).withoutNulls()
 
 inline fun <reified T: Any> T.toJson(serializer: KSerializer<T>): JsonObject = Json.nonstrict.toJson(