diff --git a/bot.go b/bot.go
index 9301953..b11559f 100644
--- a/bot.go
+++ b/bot.go
@@ -229,6 +229,16 @@ func (b *Bot) ProcessUpdate(upd Update) {
 			return
 		}
 
+		if m.Invoice != nil {
+			b.handle(OnInvoice, m)
+			return
+		}
+
+		if m.Payment != nil {
+			b.handle(OnPayment, m)
+			return
+		}
+
 		wasAdded := (m.UserJoined != nil && m.UserJoined.ID == b.Me.ID) ||
 			(m.UsersJoined != nil && isUserInList(b.Me, m.UsersJoined))
 		if m.GroupCreated || m.SuperGroupCreated || wasAdded {
diff --git a/message.go b/message.go
index 91072a4..8877642 100644
--- a/message.go
+++ b/message.go
@@ -192,6 +192,12 @@ type Message struct {
 	// if it is itself a reply.
 	PinnedMessage *Message `json:"pinned_message"`
 
+	// Message is an invoice for a payment.
+	Invoice *Invoice `json:"invoice"`
+
+	// Message is a service message about a successful payment.
+	Payment *Payment `json:"successful_payment"`
+
 	// The domain name of the website on which the user has logged in.
 	ConnectedWebsite string `json:"connected_website,omitempty"`
 
diff --git a/payments.go b/payments.go
index ca88296..8a012a5 100644
--- a/payments.go
+++ b/payments.go
@@ -30,6 +30,17 @@ type ShippingOption struct {
 	Prices []Price `json:"prices"`
 }
 
+// Payment contains basic information about a successful payment.
+type Payment struct {
+	Currency         Currency `json:"currency"`
+	Total            int      `json:"total_amount"`
+	Payload          string   `json:"invoice_payload"`
+	OptionID         string   `json:"shipping_option_id"`
+	Order            Order    `json:"order_info"`
+	TelegramChargeID string   `json:"telegram_payment_charge_id"`
+	ProviderChargeID string   `json:"provider_payment_charge_id"`
+}
+
 // PreCheckoutQuery contains information about an incoming pre-checkout query.
 type PreCheckoutQuery struct {
 	Sender   *User  `json:"from"`
@@ -51,22 +62,22 @@ type Order struct {
 
 // Invoice contains basic information about an invoice.
 type Invoice struct {
-	Title        string  `json:"title"`
-	Description  string  `json:"description"`
-	Payload      string  `json:"payload"`
-	Token        string  `json:"provider_token"`
-	Currency     string  `json:"currency"`
-	Prices       []Price `json:"prices"`
-	ProviderData string  `json:"provider_data"`
+	Title       string  `json:"title"`
+	Description string  `json:"description"`
+	Payload     string  `json:"payload"`
+	Currency    string  `json:"currency"`
+	Prices      []Price `json:"prices"`
+	Token       string  `json:"provider_token"`
+	Data        string  `json:"provider_data"`
 
 	Photo     *Photo `json:"photo"`
 	PhotoSize int    `json:"photo_size"`
 
-	// Start is a unique deep-linking parameter that can be used to
+	// Unique deep-linking parameter that can be used to
 	// generate this invoice when used as a start parameter.
 	Start string `json:"start_parameter"`
 
-	// Total shows the total price in the smallest units of the currency.
+	// Shows the total price in the smallest units of the currency.
 	// For example, for a price of US$ 1.45 pass amount = 145.
 	Total int `json:"total_amount"`
 
@@ -76,7 +87,7 @@ type Invoice struct {
 	NeedShippingAddress bool `json:"need_shipping_address"`
 	SendPhoneNumber     bool `json:"send_phone_number_to_provider"`
 	SendEmail           bool `json:"send_email_to_provider"`
-	IsFlexible          bool `json:"is_flexible"`
+	Flexible            bool `json:"is_flexible"`
 }
 
 // Price represents a portion of the price for goods or services.
diff --git a/sendable.go b/sendable.go
index 7dff1b8..5816d72 100644
--- a/sendable.go
+++ b/sendable.go
@@ -295,8 +295,6 @@ func (v *Venue) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error) {
 
 // Send delivers invoice through bot b to recipient.
 func (i *Invoice) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error) {
-	prices, _ := json.Marshal(i.Prices)
-
 	params := map[string]string{
 		"chat_id":                       to.Recipient(),
 		"title":                         i.Title,
@@ -305,14 +303,13 @@ func (i *Invoice) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error)
 		"payload":                       i.Payload,
 		"provider_token":                i.Token,
 		"currency":                      i.Currency,
-		"prices":                        string(prices),
 		"need_name":                     strconv.FormatBool(i.NeedName),
 		"need_phone_number":             strconv.FormatBool(i.NeedPhoneNumber),
 		"need_email":                    strconv.FormatBool(i.NeedEmail),
 		"need_shipping_address":         strconv.FormatBool(i.NeedShippingAddress),
 		"send_phone_number_to_provider": strconv.FormatBool(i.SendPhoneNumber),
 		"send_email_to_provider":        strconv.FormatBool(i.SendEmail),
-		"is_flexible":                   strconv.FormatBool(i.IsFlexible),
+		"is_flexible":                   strconv.FormatBool(i.Flexible),
 	}
 	if i.Photo != nil {
 		if i.Photo.FileURL != "" {
@@ -328,6 +325,10 @@ func (i *Invoice) Send(b *Bot, to Recipient, opt *SendOptions) (*Message, error)
 			params["photo_height"] = strconv.Itoa(i.Photo.Height)
 		}
 	}
+	if len(i.Prices) > 0 {
+		data, _ := json.Marshal(i.Prices)
+		params["prices"] = string(data)
+	}
 	embedSendOptions(params, opt)
 
 	data, err := b.Raw("sendInvoice", params)
diff --git a/telebot.go b/telebot.go
index 7e1f790..be4c864 100644
--- a/telebot.go
+++ b/telebot.go
@@ -64,6 +64,8 @@ const (
 	OnChannelPost       = "\achan_post"
 	OnEditedChannelPost = "\achan_edited_post"
 	OnDice              = "\adice"
+	OnInvoice           = "\ainvoice"
+	OnPayment           = "\apayment"
 
 	// Will fire when bot is added to a group.
 	OnAddedToGroup = "\aadded_to_group"