diff --git a/aiogram/api.py b/aiogram/api.py
index c44cbfb1..80d1f3a2 100644
--- a/aiogram/api.py
+++ b/aiogram/api.py
@@ -7,6 +7,9 @@ from .exceptions import ValidationError, TelegramAPIError
 
 log = logging.getLogger(__name__)
 
+API_URL = "https://api.telegram.org/bot{token}/{method}"
+FILE_URL = "https://api.telegram.org/file/bot{token}/{file_id}"
+
 
 def check_token(token):
     if any(x.isspace() for x in token):
@@ -119,7 +122,6 @@ class ApiMethods:
     EDIT_MESSAGE_CAPTION = 'editMessageCaption'
     EDIT_MESSAGE_REPLY_MARKUP = 'editMessageReplyMarkup'
     DELETE_MESSAGE = 'deleteMessage'
-
-
-API_URL = "https://api.telegram.org/bot{token}/{method}"
-FILE_URL = "https://api.telegram.org/file/bot{token}/{file_id}"
+    SEND_INVOICE = 'sendInvoice'
+    ANSWER_SHIPPING_QUERY = 'answerShippingQuery'
+    ANSWER_PRE_CHECKOUT_QUERY = 'answerPreCheckoutQuery'
diff --git a/aiogram/bot.py b/aiogram/bot.py
index cf3cd180..a4fe37eb 100644
--- a/aiogram/bot.py
+++ b/aiogram/bot.py
@@ -348,3 +348,32 @@ class Bot:
 
         await self.request(api.ApiMethods.DELETE_MESSAGE, payload)
         return True
+
+    async def send_invoice(self, chat_id: int, title: str, description: str, payload: str, provider_token: str,
+                           start_parameter: str, currency: str, prices: [types.LabeledPrice], photo_url: str = None,
+                           photo_size: int = None, photo_width: int = None, photo_height: int = None,
+                           need_name: bool = None, need_phone_number: bool = None, need_email: bool = None,
+                           need_shipping_address: bool = None, is_flexible: bool = None,
+                           disable_notification: bool = None, reply_to_message_id: int = None,
+                           reply_markup: types.InlineKeyboardMarkup = None) -> types.Message:
+        if reply_markup and hasattr(reply_markup, 'to_json'):
+            reply_markup = json.dumps(reply_markup.to_json())
+        prices = json.dumps([item.to_json() for item in prices])
+
+        payload_ = generate_payload(**locals())
+
+        message = await self.request(api.ApiMethods.SEND_INVOICE, payload_)
+        return self.prepare_object(types.Message.de_json(message))
+
+    async def answer_shipping_query(self, shipping_query_id: str, ok: bool,
+                                    shipping_options: [types.ShippingOption] = None, error_message: str = None) -> None:
+        shipping_options = json.dumps([item.to_json() for item in shipping_options])
+
+        payload = generate_payload(**locals())
+
+        return await self.request(api.ApiMethods.ANSWER_SHIPPING_QUERY, payload)
+
+    async def answer_pre_checkout_query(self, pre_checkout_query_id: str, ok: bool, error_message: str = None) -> bool:
+        payload = generate_payload(**locals())
+
+        return await self.request(api.ApiMethods.ANSWER_PRE_CHECKOUT_QUERY, payload)
diff --git a/aiogram/types/__init__.py b/aiogram/types/__init__.py
index 31f977eb..c706a915 100644
--- a/aiogram/types/__init__.py
+++ b/aiogram/types/__init__.py
@@ -22,6 +22,7 @@ from .inline_query_result import InlineQueryResult, InlineQueryResultArticle, In
     InputLocationMessageContent, InputMessageContent, InputTextMessageContent, InputTextMessageContent, \
     InputVenueMessageContent, InputVenueMessageContent
 from .invoice import Invoice
+from .labeled_price import LabeledPrice
 from .location import Location
 from .message import Message, ContentType, ParseMode
 from .message_entity import MessageEntity
@@ -30,6 +31,7 @@ from .photo_size import PhotoSize
 from .pre_checkout_query import PreCheckoutQuery
 from .reply_keyboard import KeyboardButton, ReplyKeyboardMarkup, ReplyKeyboardRemove
 from .shipping_address import ShippingAddress
+from .shipping_option import ShippingOption
 from .shipping_query import ShippingQuery
 from .sticker import Sticker
 from .successful_payment import SuccessfulPayment
@@ -96,6 +98,7 @@ __all__ = [
     'InputVenueMessageContent',
     'Invoice',
     'KeyboardButton',
+    'LabeledPrice',
     'Location',
     'Message',
     'MessageEntity',
@@ -106,6 +109,7 @@ __all__ = [
     'ReplyKeyboardMarkup',
     'ReplyKeyboardRemove',
     'ShippingAddress',
+    'ShippingOption',
     'ShippingQuery',
     'Sticker',
     'SuccessfulPayment',
diff --git a/aiogram/types/base.py b/aiogram/types/base.py
index 37206d1b..2604af07 100644
--- a/aiogram/types/base.py
+++ b/aiogram/types/base.py
@@ -18,10 +18,10 @@ class Serializable:
         """
         Returns a JSON string representation of this class.
 
-        This function must be overridden by subclasses.
-        :return: a JSON formatted string.
+        :return: a JSON.
         """
-        raise NotImplementedError
+        return {k: v.to_json() if hasattr(v, 'to_json') else v for k, v in self.__dict__.items() if
+                not k.startswith('_')}
 
 
 class Deserializable:
diff --git a/aiogram/types/labeled_price.py b/aiogram/types/labeled_price.py
new file mode 100644
index 00000000..f6c5db69
--- /dev/null
+++ b/aiogram/types/labeled_price.py
@@ -0,0 +1,7 @@
+from .base import Serializable
+
+
+class LabeledPrice(Serializable):
+    def __init__(self, label, amount):
+        self.label = label
+        self.amount = amount
diff --git a/aiogram/types/shipping_option.py b/aiogram/types/shipping_option.py
new file mode 100644
index 00000000..5bc539bd
--- /dev/null
+++ b/aiogram/types/shipping_option.py
@@ -0,0 +1,8 @@
+from .base import Serializable
+
+
+class ShippingOption(Serializable):
+    def __init__(self, id, title, prices):
+        self.id = id
+        self.title = title
+        self.prices = prices