implement bot api 7.7 (#728)

bot_test.go

@@ -234,6 +234,10 @@ func TestBotProcessUpdate(t *testing.T) {
 		assert.NotNil(t, c.Message().Payment)
 		return nil
 	})
+	b.Handle(OnRefund, func(c Context) error {
+		assert.NotNil(t, c.Message().RefundedPayment)
+		return nil
+	})
 	b.Handle(OnAddedToGroup, func(c Context) error {
 		assert.NotNil(t, c.Message().GroupCreated)
 		return nil
@@ -334,6 +338,7 @@ func TestBotProcessUpdate(t *testing.T) {
 	b.ProcessUpdate(Update{Message: &Message{Venue: &Venue{}}})
 	b.ProcessUpdate(Update{Message: &Message{Invoice: &Invoice{}}})
 	b.ProcessUpdate(Update{Message: &Message{Payment: &Payment{}}})
+	b.ProcessUpdate(Update{Message: &Message{RefundedPayment: &RefundedPayment{}}})
 	b.ProcessUpdate(Update{Message: &Message{Dice: &Dice{}}})
 	b.ProcessUpdate(Update{Message: &Message{GroupCreated: true}})
 	b.ProcessUpdate(Update{Message: &Message{UserJoined: &User{ID: 1}}})

message.go

@@ -282,6 +282,9 @@ type Message struct {
 	// Message is a service message about a successful payment.
 	Payment *Payment `json:"successful_payment"`
 
+	// Message is a service message about a refunded payment, information about the payment.
+	RefundedPayment *RefundedPayment `json:"refunded_payment"`
+
 	// For a service message, a user was shared with the bot.
 	UserShared *RecipientShared `json:"users_shared,omitempty"`
 

payments.go

@@ -45,6 +45,14 @@ type Payment struct {
 	ProviderChargeID string `json:"provider_payment_charge_id"`
 }
 
+type RefundedPayment struct {
+	Currency         string `json:"currency"`
+	TotalAmount      int    `json:"total_amount"`
+	InvoicePayload   string `json:"invoice_payload"`
+	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"`

telebot.go

@@ -60,6 +60,7 @@ const (
 	OnDice                 = "\adice"
 	OnInvoice              = "\ainvoice"
 	OnPayment              = "\apayment"
+	OnRefund               = "\arefund"
 	OnGame                 = "\agame"
 	OnPoll                 = "\apoll"
 	OnPollAnswer           = "\apoll_answer"

update.go

@@ -106,7 +106,10 @@ func (b *Bot) ProcessUpdate(u Update) {
 			b.handle(OnPayment, c)
 			return
 		}
-
+		if m.RefundedPayment != nil {
+			b.handle(OnRefund, c)
+			return
+		}
 		if m.TopicCreated != nil {
 			b.handle(OnTopicCreated, c)
 			return