diff --git a/library/build.gradle b/library/build.gradle
index df95e5a2..4f1d20dc 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -16,6 +16,7 @@ dependencies {
     testImplementation 'junit:junit:4.13.1'
     testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.1.13'
     testImplementation 'org.reflections:reflections:0.9.12'
+    testImplementation 'org.jetbrains.kotlin:kotlin-reflect'
 }
 
 jar {
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/PreparedInlineMessage.kt b/library/src/main/java/com/pengrad/telegrambot/model/PreparedInlineMessage.kt
new file mode 100644
index 00000000..7c68320a
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/model/PreparedInlineMessage.kt
@@ -0,0 +1,6 @@
+package com.pengrad.telegrambot.model
+
+data class PreparedInlineMessage(
+    @get:JvmName("id") val id: String,
+    @get:JvmName("expirationDate") val expirationDate: Int
+)
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.java b/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.java
deleted file mode 100644
index 64e81c31..00000000
--- a/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.java
+++ /dev/null
@@ -1,92 +0,0 @@
-package com.pengrad.telegrambot.model;
-
-import java.io.Serializable;
-
-/**
- * Stas Parshin
- * 24 May 2017
- */
-public class SuccessfulPayment implements Serializable {
-    private final static long serialVersionUID = 0L;
-
-    private String currency;
-    private Integer total_amount;
-    private String invoice_payload;
-    private String shipping_option_id;
-    private OrderInfo order_info;
-    private String telegram_payment_charge_id;
-    private String provider_payment_charge_id;
-
-    public String currency() {
-        return currency;
-    }
-
-    public Integer totalAmount() {
-        return total_amount;
-    }
-
-    public String invoicePayload() {
-        return invoice_payload;
-    }
-
-    public String shippingOptionId() {
-        return shipping_option_id;
-    }
-
-    public OrderInfo orderInfo() {
-        return order_info;
-    }
-
-    public String telegramPaymentChargeId() {
-        return telegram_payment_charge_id;
-    }
-
-    public String providerPaymentChargeId() {
-        return provider_payment_charge_id;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        SuccessfulPayment that = (SuccessfulPayment) o;
-
-        if (currency != null ? !currency.equals(that.currency) : that.currency != null) return false;
-        if (total_amount != null ? !total_amount.equals(that.total_amount) : that.total_amount != null) return false;
-        if (invoice_payload != null ? !invoice_payload.equals(that.invoice_payload) : that.invoice_payload != null)
-            return false;
-        if (shipping_option_id != null ? !shipping_option_id.equals(that.shipping_option_id) : that.shipping_option_id != null)
-            return false;
-        if (order_info != null ? !order_info.equals(that.order_info) : that.order_info != null) return false;
-        if (telegram_payment_charge_id != null ? !telegram_payment_charge_id.equals(that.telegram_payment_charge_id) : that.telegram_payment_charge_id != null)
-            return false;
-        return provider_payment_charge_id != null ? provider_payment_charge_id.equals(that.provider_payment_charge_id) : that.provider_payment_charge_id == null;
-
-    }
-
-    @Override
-    public int hashCode() {
-        int result = currency != null ? currency.hashCode() : 0;
-        result = 31 * result + (total_amount != null ? total_amount.hashCode() : 0);
-        result = 31 * result + (invoice_payload != null ? invoice_payload.hashCode() : 0);
-        result = 31 * result + (shipping_option_id != null ? shipping_option_id.hashCode() : 0);
-        result = 31 * result + (order_info != null ? order_info.hashCode() : 0);
-        result = 31 * result + (telegram_payment_charge_id != null ? telegram_payment_charge_id.hashCode() : 0);
-        result = 31 * result + (provider_payment_charge_id != null ? provider_payment_charge_id.hashCode() : 0);
-        return result;
-    }
-
-    @Override
-    public String toString() {
-        return "SuccessfulPayment{" +
-                "currency='" + currency + '\'' +
-                ", total_amount=" + total_amount +
-                ", invoice_payload='" + invoice_payload + '\'' +
-                ", shipping_option_id='" + shipping_option_id + '\'' +
-                ", order_info=" + order_info +
-                ", telegram_payment_charge_id='" + telegram_payment_charge_id + '\'' +
-                ", provider_payment_charge_id='" + provider_payment_charge_id + '\'' +
-                '}';
-    }
-}
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.kt b/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.kt
new file mode 100644
index 00000000..a888f036
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/model/SuccessfulPayment.kt
@@ -0,0 +1,14 @@
+package com.pengrad.telegrambot.model
+
+data class SuccessfulPayment(
+    @get:JvmName("currency") val currency: String,
+    @get:JvmName("totalAmount") val totalAmount: Int,
+    @get:JvmName("invoicePayload") val invoicePayload: String,
+    @get:JvmName("subscriptionExpirationDate") val subscriptionExpirationDate: Int? = null,
+    @get:JvmName("isRecurring") val isRecurring: Boolean? = null,
+    @get:JvmName("isFirstRecurring") val isFirstRecurring: Boolean? = null,
+    @get:JvmName("shippingOptionId") val shippingOptionId: String? = null,
+    @get:JvmName("orderInfo") val orderInfo: OrderInfo? = null,
+    @get:JvmName("telegramPaymentChargeId") val telegramPaymentChargeId: String,
+    @get:JvmName("providerPaymentChargeId") val providerPaymentChargeId: String
+)
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/gift/Gift.kt b/library/src/main/java/com/pengrad/telegrambot/model/gift/Gift.kt
new file mode 100644
index 00000000..eef53655
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/model/gift/Gift.kt
@@ -0,0 +1,11 @@
+package com.pengrad.telegrambot.model.gift
+
+import com.pengrad.telegrambot.model.Sticker
+
+data class Gift(
+    @get:JvmName("id") val id: String,
+    @get:JvmName("sticker") val sticker: Sticker,
+    @get:JvmName("starCount") val starCount: Int,
+    @get:JvmName("totalCount") val totalCount: Int,
+    @get:JvmName("remainingCount") val remainingCount: Int
+)
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/gift/Gifts.kt b/library/src/main/java/com/pengrad/telegrambot/model/gift/Gifts.kt
new file mode 100644
index 00000000..640c4b0d
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/model/gift/Gifts.kt
@@ -0,0 +1,18 @@
+package com.pengrad.telegrambot.model.gift
+
+data class Gifts(
+    @get:JvmName("gifts") val gifts: Array<Gift>
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is Gifts) return false
+
+        if (!gifts.contentEquals(other.gifts)) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return gifts.contentHashCode()
+    }
+}
diff --git a/library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerUser.java b/library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerUser.java
index 20cb6a9a..11e6097a 100644
--- a/library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerUser.java
+++ b/library/src/main/java/com/pengrad/telegrambot/model/stars/partner/TransactionPartnerUser.java
@@ -2,6 +2,7 @@
 
 import com.pengrad.telegrambot.model.User;
 import com.pengrad.telegrambot.model.chatbackground.BackgroundFillFreeformGradient;
+import com.pengrad.telegrambot.model.gift.Gift;
 import com.pengrad.telegrambot.model.paidmedia.PaidMedia;
 
 import java.util.Arrays;
@@ -15,6 +16,8 @@ public class TransactionPartnerUser extends TransactionPartner {
     private String invoice_payload;
     private PaidMedia[] paid_media;
     private String paid_media_payload;
+    private Integer subscription_period;
+    private Gift gift;
 
     public TransactionPartnerUser() {
         super(TYPE);
@@ -36,6 +39,14 @@ public String paidMediaPayload() {
         return paid_media_payload;
     }
 
+    public Integer subscriptionPeriod() {
+        return subscription_period;
+    }
+
+    public Gift gift() {
+        return gift;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
@@ -45,12 +56,22 @@ public boolean equals(Object o) {
         return Objects.equals(user, that.user)
             && Objects.equals(invoice_payload, that.invoice_payload)
             && Objects.deepEquals(paid_media, that.paid_media)
-            && Objects.equals(paid_media_payload, that.paid_media_payload);
+            && Objects.equals(paid_media_payload, that.paid_media_payload)
+            && Objects.equals(subscription_period, that.subscription_period)
+            && Objects.equals(gift, that.gift);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(super.hashCode(), user, invoice_payload, Arrays.hashCode(paid_media));
+        return Objects.hash(
+            super.hashCode(),
+            user,
+            invoice_payload,
+            Arrays.hashCode(paid_media),
+            paid_media_payload,
+            subscription_period,
+            gift
+        );
     }
 
     @Override
@@ -60,6 +81,8 @@ public String toString() {
                 ", invoice_payload='" + invoice_payload + '\'' +
                 ", paid_media=" + Arrays.toString(paid_media) +
                 ", paid_media_payload='" + paid_media_payload + '\'' +
+                ", subscription_period='" + subscription_period + '\'' +
+                ", gift=" + gift +
                 '}';
     }
 }
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.java b/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.java
deleted file mode 100644
index 5661a63d..00000000
--- a/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.java
+++ /dev/null
@@ -1,97 +0,0 @@
-package com.pengrad.telegrambot.request;
-
-import com.pengrad.telegrambot.model.request.LabeledPrice;
-import com.pengrad.telegrambot.response.StringResponse;
-
-/**
- * Mirco Ianese
- * 21 Jun 2022
- */
-public class CreateInvoiceLink extends BaseRequest<CreateInvoiceLink, StringResponse> {
-
-    public CreateInvoiceLink(String title, String description, String payload, String currency, LabeledPrice... prices) {
-        super(StringResponse.class);
-        add("title", title).add("description", description).add("payload", payload)
-            .add("currency", currency).add("prices", prices);
-    }
-
-
-    /**
-     * Backward compatibility: API 7.4, parameter "provider_token" became optional
-     * @deprecated Use constrcutor without 'provider_token' instead
-     */
-    @Deprecated
-    public CreateInvoiceLink(String title, String description, String payload, String providerToken,
-                             String currency, LabeledPrice... prices) {
-        super(StringResponse.class);
-        add("title", title).add("description", description).add("payload", payload)
-                .add("provider_token", providerToken).add("currency", currency).add("prices", prices);
-    }
-
-    public CreateInvoiceLink providerToken(String providerToken) {
-        return add("provider_token", providerToken);
-    }
-
-    /**
-     * @param maxTipAmount The maximum accepted amount for tips in the smallest units of the currency
-     */
-    public CreateInvoiceLink maxTipAmount(int maxTipAmount) {
-        return add("max_tip_amount", maxTipAmount);
-    }
-
-    /**
-     * @param suggestedTipAmounts An array of suggested amounts of tip in the smallest units of the currency. At most 4 suggested tip amounts can be specified. The suggested tip amounts must be positive, passed in a strictly increased order and must not exceed max_tip_amount.
-     */
-    public CreateInvoiceLink suggestedTipAmounts(Integer[] suggestedTipAmounts) {
-        return add("suggested_tip_amounts", suggestedTipAmounts);
-    }
-
-    public CreateInvoiceLink providerData(String providerData) {
-        return add("provider_data", providerData);
-    }
-
-    public CreateInvoiceLink photoUrl(String photoUrl) {
-        return add("photo_url", photoUrl);
-    }
-
-    public CreateInvoiceLink photoSize(Integer photoSize) {
-        return add("photo_size", photoSize);
-    }
-
-    public CreateInvoiceLink photoWidth(Integer photoWidth) {
-        return add("photo_width", photoWidth);
-    }
-
-    public CreateInvoiceLink photoHeight(Integer photoHeight) {
-        return add("photo_height", photoHeight);
-    }
-
-    public CreateInvoiceLink needName(boolean needName) {
-        return add("need_name", needName);
-    }
-
-    public CreateInvoiceLink needPhoneNumber(boolean needPhoneNumber) {
-        return add("need_phone_number", needPhoneNumber);
-    }
-
-    public CreateInvoiceLink needEmail(boolean needEmail) {
-        return add("need_email", needEmail);
-    }
-
-    public CreateInvoiceLink needShippingAddress(boolean needShippingAddress) {
-        return add("need_shipping_address", needShippingAddress);
-    }
-
-    public CreateInvoiceLink sendEmailToProvider(boolean sendEmailToProvider) {
-        return add("send_email_to_provider", sendEmailToProvider);
-    }
-
-    public CreateInvoiceLink sendPhoneNumberToProvider(boolean sendPhoneNumberToProvider) {
-        return add("send_phone_number_to_provider", sendPhoneNumberToProvider);
-    }
-
-    public CreateInvoiceLink isFlexible(boolean isFlexible) {
-        return add("is_flexible", isFlexible);
-    }
-
-}
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.kt b/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.kt
new file mode 100644
index 00000000..4e96dd1c
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/CreateInvoiceLink.kt
@@ -0,0 +1,90 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.model.request.LabeledPrice
+import com.pengrad.telegrambot.response.StringResponse
+import com.pengrad.telegrambot.utility.kotlin.optionalRequestParameter
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+class CreateInvoiceLink(
+    title: String,
+    description: String,
+    payload: String,
+    currency: String,
+    vararg prices: LabeledPrice
+) : KBaseRequest<CreateInvoiceLink, StringResponse>(StringResponse::class) {
+
+    /**
+     * Backward compatibility: API 7.4, parameter "provider_token" became optional
+     * @deprecated Use constructor without 'provider_token' instead
+     */
+    @Deprecated("Use constructor without 'providerToken' parameter", ReplaceWith("CreateInvoiceLink(title, description, payload, currency, *prices)"))
+    constructor(
+        title: String,
+        description: String,
+        payload: String,
+        providerToken: String,
+        currency: String,
+        vararg prices: LabeledPrice
+    ) : this(title, description, payload, currency, *prices) {
+        this.providerToken = providerToken
+    }
+
+    val title: String by requestParameter(title)
+    val description: String by requestParameter(description)
+    val payload: String by requestParameter(payload)
+    val currency: String by requestParameter(currency)
+    val prices: Array<LabeledPrice> by requestParameter(arrayOf(*prices))
+
+    var providerToken: String? by optionalRequestParameter()
+    var subscriptionPeriod: Int? by optionalRequestParameter()
+    var businessConnectionId: String? by optionalRequestParameter()
+    var maxTipAmount: Int? by optionalRequestParameter()
+    var suggestedTipAmounts: Array<Int>? by optionalRequestParameter()
+    var providerData: String? by optionalRequestParameter()
+    var photoUrl: String? by optionalRequestParameter()
+    var photoSize: Int? by optionalRequestParameter()
+    var photoWidth: Int? by optionalRequestParameter()
+    var photoHeight: Int? by optionalRequestParameter()
+    var needName: Boolean? by optionalRequestParameter()
+    var needPhoneNumber: Boolean? by optionalRequestParameter()
+    var needEmail: Boolean? by optionalRequestParameter()
+    var needShippingAddress: Boolean? by optionalRequestParameter()
+    var sendEmailToProvider: Boolean? by optionalRequestParameter()
+    var sendPhoneNumberToProvider: Boolean? by optionalRequestParameter()
+    var isFlexible: Boolean? by optionalRequestParameter()
+
+    fun providerToken(providerToken: String) = apply { this.providerToken = providerToken }
+
+    fun subscriptionPeriod(subscriptionPeriod: Int) = apply { this.subscriptionPeriod = subscriptionPeriod }
+
+    fun businessConnectionId(businessConnectionId: String) = apply { this.businessConnectionId = businessConnectionId }
+
+    fun maxTipAmount(maxTipAmount: Int) = apply { this.maxTipAmount = maxTipAmount }
+
+    fun suggestedTipAmounts(suggestedTipAmounts: Array<Int>) = apply { this.suggestedTipAmounts = suggestedTipAmounts }
+
+    fun providerData(providerData: String) = apply { this.providerData = providerData }
+
+    fun photoUrl(photoUrl: String) = apply { this.photoUrl = photoUrl }
+
+    fun photoSize(photoSize: Int) = apply { this.photoSize = photoSize }
+
+    fun photoWidth(photoWidth: Int) = apply { this.photoWidth = photoWidth }
+
+    fun photoHeight(photoHeight: Int) = apply { this.photoHeight = photoHeight }
+
+    fun needName(needName: Boolean) = apply { this.needName = needName }
+
+    fun needPhoneNumber(needPhoneNumber: Boolean) = apply { this.needPhoneNumber = needPhoneNumber }
+
+    fun needEmail(needEmail: Boolean) = apply { this.needEmail = needEmail }
+
+    fun needShippingAddress(needShippingAddress: Boolean) = apply { this.needShippingAddress = needShippingAddress }
+
+    fun sendEmailToProvider(sendEmailToProvider: Boolean) = apply { this.sendEmailToProvider = sendEmailToProvider }
+
+    fun sendPhoneNumberToProvider(sendPhoneNumberToProvider: Boolean) = apply { this.sendPhoneNumberToProvider = sendPhoneNumberToProvider }
+
+    fun isFlexible(isFlexible: Boolean) = apply { this.isFlexible = isFlexible }
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/EditUserStarSubscription.kt b/library/src/main/java/com/pengrad/telegrambot/request/EditUserStarSubscription.kt
new file mode 100644
index 00000000..23061060
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/EditUserStarSubscription.kt
@@ -0,0 +1,16 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+class EditUserStarSubscription(
+    userId: Long,
+    telegramPaymentChargeId: String,
+    isCanceled: Boolean
+) : KBaseRequest<EditUserStarSubscription, BaseResponse>(BaseResponse::class) {
+
+    val userId: Long by requestParameter(userId)
+    val telegramPaymentChargeId: String by requestParameter(telegramPaymentChargeId)
+    val isCanceled: Boolean by requestParameter(isCanceled)
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/GetAvailableGifts.kt b/library/src/main/java/com/pengrad/telegrambot/request/GetAvailableGifts.kt
new file mode 100644
index 00000000..dc2868cd
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/GetAvailableGifts.kt
@@ -0,0 +1,7 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.response.GetAvailableGiftsResponse
+
+class GetAvailableGifts : KBaseRequest<GetAvailableGifts, GetAvailableGiftsResponse>(
+    GetAvailableGiftsResponse::class
+)
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/KBaseRequest.kt b/library/src/main/java/com/pengrad/telegrambot/request/KBaseRequest.kt
new file mode 100644
index 00000000..c732d542
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/KBaseRequest.kt
@@ -0,0 +1,14 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.response.BaseResponse
+import kotlin.reflect.KClass
+
+abstract class KBaseRequest<T : BaseRequest<T, R>, R : BaseResponse>(
+    clazz: KClass<R>
+) : BaseRequest<T, R>(clazz.java) {
+
+    internal fun addParameter(name: String, value: Any?): T {
+        return add(name, value)
+    }
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/SavePreparedInlineMessage.kt b/library/src/main/java/com/pengrad/telegrambot/request/SavePreparedInlineMessage.kt
new file mode 100644
index 00000000..51561b39
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/SavePreparedInlineMessage.kt
@@ -0,0 +1,32 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.model.request.InlineQueryResult
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.response.SavePreparedInlineMessageResponse
+import com.pengrad.telegrambot.utility.kotlin.optionalRequestParameter
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+class SavePreparedInlineMessage(
+    userId: Long,
+    result: InlineQueryResult<*>
+) : KBaseRequest<SavePreparedInlineMessage, SavePreparedInlineMessageResponse>(
+    SavePreparedInlineMessageResponse::class
+) {
+
+    val userId: Long by requestParameter(userId)
+    val result: InlineQueryResult<*> by requestParameter(result)
+
+    var allowUserChats: Boolean? by optionalRequestParameter()
+    var allowBotChats: Boolean? by optionalRequestParameter()
+    var allowGroupChats: Boolean? by optionalRequestParameter()
+    var allowChannelChats: Boolean? by optionalRequestParameter()
+
+    fun allowUserChats(allowUserChats: Boolean) = apply { this.allowUserChats = allowUserChats }
+
+    fun allowBotChats(allowBotChats: Boolean) = apply { this.allowBotChats = allowBotChats }
+
+    fun allowGroupChats(allowGroupChats: Boolean) = apply { this.allowGroupChats = allowGroupChats }
+
+    fun allowChannelChats(allowChannelChats: Boolean) = apply { this.allowChannelChats = allowChannelChats }
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/SendGift.kt b/library/src/main/java/com/pengrad/telegrambot/request/SendGift.kt
new file mode 100644
index 00000000..0abb5f2f
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/SendGift.kt
@@ -0,0 +1,27 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.model.MessageEntity
+import com.pengrad.telegrambot.model.request.ParseMode
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.utility.kotlin.optionalRequestParameter
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+class SendGift(
+    userId: Long,
+    giftId: String,
+) : KBaseRequest<SendGift, BaseResponse>(BaseResponse::class) {
+
+    val userId: Long by requestParameter(userId)
+    val giftId: String by requestParameter(giftId)
+
+    var text: String? by optionalRequestParameter()
+    var textParseMode: ParseMode? by optionalRequestParameter(valueMapper = { it?.name })
+    var textEntities: Array<MessageEntity>? by optionalRequestParameter()
+
+    fun text(text: String) = apply { this.text = text }
+
+    fun textParseMode(parseMode: ParseMode) = apply { this.textParseMode = textParseMode }
+
+    fun textEntities(textEntities: Array<MessageEntity>) = apply { this.textEntities = textEntities }
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/request/SetUserEmojiStatus.kt b/library/src/main/java/com/pengrad/telegrambot/request/SetUserEmojiStatus.kt
new file mode 100644
index 00000000..9a790e59
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/request/SetUserEmojiStatus.kt
@@ -0,0 +1,16 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+class SetUserEmojiStatus(
+    userId: Long,
+    emojiStatusCustomEmojiId: String,
+    emojiStatusExpirationDate: Int
+) : KBaseRequest<SetUserEmojiStatus, BaseResponse>(BaseResponse::class) {
+
+    val userId: Long by requestParameter(userId)
+    val emojiStatusCustomEmojiId: String by requestParameter(emojiStatusCustomEmojiId)
+    val emojiStatusExpirationDate: Int by requestParameter(emojiStatusExpirationDate)
+
+}
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/response/GetAvailableGiftsResponse.kt b/library/src/main/java/com/pengrad/telegrambot/response/GetAvailableGiftsResponse.kt
new file mode 100644
index 00000000..264273ee
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/response/GetAvailableGiftsResponse.kt
@@ -0,0 +1,5 @@
+package com.pengrad.telegrambot.response
+
+import com.pengrad.telegrambot.model.gift.Gifts
+
+data class GetAvailableGiftsResponse(val result: Gifts) : BaseResponse()
diff --git a/library/src/main/java/com/pengrad/telegrambot/response/SavePreparedInlineMessageResponse.kt b/library/src/main/java/com/pengrad/telegrambot/response/SavePreparedInlineMessageResponse.kt
new file mode 100644
index 00000000..1d50f83b
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/response/SavePreparedInlineMessageResponse.kt
@@ -0,0 +1,7 @@
+package com.pengrad.telegrambot.response
+
+import com.pengrad.telegrambot.model.PreparedInlineMessage
+
+data class SavePreparedInlineMessageResponse(
+    val result: PreparedInlineMessage
+) : BaseResponse()
\ No newline at end of file
diff --git a/library/src/main/java/com/pengrad/telegrambot/utility/kotlin/RequestParameterDelegate.kt b/library/src/main/java/com/pengrad/telegrambot/utility/kotlin/RequestParameterDelegate.kt
new file mode 100644
index 00000000..e1da6fd1
--- /dev/null
+++ b/library/src/main/java/com/pengrad/telegrambot/utility/kotlin/RequestParameterDelegate.kt
@@ -0,0 +1,69 @@
+package com.pengrad.telegrambot.utility.kotlin
+
+import com.pengrad.telegrambot.request.KBaseRequest
+import kotlin.properties.PropertyDelegateProvider
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+typealias RequestParameterValueMapper<I, O> = (I) -> O
+
+fun <T : KBaseRequest<*, *>, V : Any> requestParameter(
+    initialValue: V,
+    customParameterName: String? = null
+) : RequestParameterDelegate<T, V> = RequestParameterDelegate(
+    value = initialValue,
+    customParameterName = customParameterName
+)
+
+fun <T : KBaseRequest<*, *>, V : Any?> optionalRequestParameter(
+    initialValue: V? = null,
+    customParameterName: String? = null,
+    valueMapper: RequestParameterValueMapper<V?, Any?>? = null
+) : RequestParameterDelegate<T, V?> = RequestParameterDelegate(
+    value = initialValue,
+    customParameterName = customParameterName,
+    valueMapper = valueMapper
+)
+
+class RequestParameterDelegate<T : KBaseRequest<*, *>, V>(
+    private var value: V,
+    private val customParameterName: String? = null,
+    private val valueMapper: RequestParameterValueMapper<V, Any?>? = null
+) : ReadWriteProperty<T, V>, PropertyDelegateProvider<T, RequestParameterDelegate<T, V>> {
+
+    override operator fun provideDelegate(thisRef: T, property: KProperty<*>): RequestParameterDelegate<T, V> {
+        if (value != null) {
+            updateRequestValue(thisRef, property, value)
+        }
+        return this
+    }
+
+    override operator fun getValue(thisRef: T, property: KProperty<*>): V {
+        return value
+    }
+
+    override operator fun setValue(thisRef: T, property: KProperty<*>, value: V) {
+        updateRequestValue(thisRef, property, value)
+        this.value = value
+    }
+
+    private fun updateRequestValue(thisRef: T, property: KProperty<*>, value: V) {
+        thisRef.addParameter(
+            name = customParameterName ?: convertToSnakeCase(property.name),
+            value = valueMapper?.invoke(value) ?: value
+        )
+    }
+
+}
+
+fun convertToSnakeCase(input: String): String {
+    return input.replace(Regex("([a-z])([A-Z])")) {
+        "${it.groupValues[1]}_${it.groupValues[2]}"
+    }.lowercase()
+}
+
+fun main() {
+    println(convertToSnakeCase("userTEST"))        // user_id
+    println(convertToSnakeCase("text"))          // text
+    println(convertToSnakeCase("isCancelled"))   // is_cancelled
+}
\ No newline at end of file
diff --git a/library/src/test/java/com/pengrad/telegrambot/PaymentsTest.java b/library/src/test/java/com/pengrad/telegrambot/PaymentsTest.java
index e097e13d..a7b85314 100644
--- a/library/src/test/java/com/pengrad/telegrambot/PaymentsTest.java
+++ b/library/src/test/java/com/pengrad/telegrambot/PaymentsTest.java
@@ -169,7 +169,7 @@ public void testSuccessfulPayment() {
 
         assertNotNull(payment);
         assertEquals("USD", payment.currency());
-        assertEquals(Integer.valueOf(200), payment.totalAmount());
+        assertEquals(200, payment.totalAmount());
         assertEquals("my_payload", payment.invoicePayload());
         assertEquals("2", payment.shippingOptionId());
         assertEquals("tcid", payment.telegramPaymentChargeId());
diff --git a/library/src/test/java/com/pengrad/telegrambot/ResponseTest.java b/library/src/test/java/com/pengrad/telegrambot/ResponseTest.java
index 9813a84a..53069de1 100644
--- a/library/src/test/java/com/pengrad/telegrambot/ResponseTest.java
+++ b/library/src/test/java/com/pengrad/telegrambot/ResponseTest.java
@@ -1,6 +1,8 @@
 package com.pengrad.telegrambot;
 
 import com.pengrad.telegrambot.response.BaseResponse;
+import kotlin.jvm.JvmClassMappingKt;
+import kotlin.reflect.KClass;
 import org.junit.Before;
 import org.junit.Test;
 import org.reflections.Reflections;
@@ -33,6 +35,12 @@ public void setClasses() {
     @Test
     public void testToString() throws IllegalAccessException, InstantiationException, InvocationTargetException {
         for (Class<? extends BaseResponse> c : classes) {
+            KClass<? extends BaseResponse> kclass = JvmClassMappingKt.getKotlinClass(c);
+
+            if (kclass.isData()) {
+                continue;
+            }
+
             Optional<Constructor<?>> constructor = Arrays.stream(c.getDeclaredConstructors()).filter(dc -> dc.getParameterCount() == 0).findFirst();
             assertTrue("No default constructor in " + c.getSimpleName(), constructor.isPresent());
             constructor.get().setAccessible(true);