diff --git a/client/authorization.go b/client/authorization.go
index ab08d51..6dbd8b9 100644
--- a/client/authorization.go
+++ b/client/authorization.go
@@ -46,7 +46,7 @@ func Authorize(client *Client, authorizationStateHandler AuthorizationStateHandl
 }
 
 type clientAuthorizer struct {
-	TdlibParameters chan *TdlibParameters
+	TdlibParameters chan *SetTdlibParametersRequest
 	PhoneNumber     chan string
 	Code            chan string
 	State           chan AuthorizationState
@@ -55,7 +55,7 @@ type clientAuthorizer struct {
 
 func ClientAuthorizer() *clientAuthorizer {
 	return &clientAuthorizer{
-		TdlibParameters: make(chan *TdlibParameters, 1),
+		TdlibParameters: make(chan *SetTdlibParametersRequest, 1),
 		PhoneNumber:     make(chan string, 1),
 		Code:            make(chan string, 1),
 		State:           make(chan AuthorizationState, 10),
@@ -68,13 +68,7 @@ func (stateHandler *clientAuthorizer) Handle(client *Client, state Authorization
 
 	switch state.AuthorizationStateType() {
 	case TypeAuthorizationStateWaitTdlibParameters:
-		_, err := client.SetTdlibParameters(&SetTdlibParametersRequest{
-			Parameters: <-stateHandler.TdlibParameters,
-		})
-		return err
-
-	case TypeAuthorizationStateWaitEncryptionKey:
-		_, err := client.CheckDatabaseEncryptionKey(&CheckDatabaseEncryptionKeyRequest{})
+		_, err := client.SetTdlibParameters(<-stateHandler.TdlibParameters)
 		return err
 
 	case TypeAuthorizationStateWaitPhoneNumber:
@@ -169,14 +163,14 @@ func CliInteractor(clientAuthorizer *clientAuthorizer) {
 }
 
 type botAuthorizer struct {
-	TdlibParameters chan *TdlibParameters
+	TdlibParameters chan *SetTdlibParametersRequest
 	Token           chan string
 	State           chan AuthorizationState
 }
 
 func BotAuthorizer(token string) *botAuthorizer {
 	botAuthorizer := &botAuthorizer{
-		TdlibParameters: make(chan *TdlibParameters, 1),
+		TdlibParameters: make(chan *SetTdlibParametersRequest, 1),
 		Token:           make(chan string, 1),
 		State:           make(chan AuthorizationState, 10),
 	}
@@ -191,13 +185,7 @@ func (stateHandler *botAuthorizer) Handle(client *Client, state AuthorizationSta
 
 	switch state.AuthorizationStateType() {
 	case TypeAuthorizationStateWaitTdlibParameters:
-		_, err := client.SetTdlibParameters(&SetTdlibParametersRequest{
-			Parameters: <-stateHandler.TdlibParameters,
-		})
-		return err
-
-	case TypeAuthorizationStateWaitEncryptionKey:
-		_, err := client.CheckDatabaseEncryptionKey(&CheckDatabaseEncryptionKeyRequest{})
+		_, err := client.SetTdlibParameters(<-stateHandler.TdlibParameters)
 		return err
 
 	case TypeAuthorizationStateWaitPhoneNumber:
diff --git a/example/bot/Bot.go b/example/bot/Bot.go
index 0e19a72..0c4d570 100644
--- a/example/bot/Bot.go
+++ b/example/bot/Bot.go
@@ -9,8 +9,8 @@ import (
 	tdlib "github.com/c0re100/gotdlib/client"
 )
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",
diff --git a/example/command/ReplyCommand.go b/example/command/ReplyCommand.go
index 595d2fa..22b4a6e 100644
--- a/example/command/ReplyCommand.go
+++ b/example/command/ReplyCommand.go
@@ -17,8 +17,8 @@ func GetSenderId(sender tdlib.MessageSender) int64 {
 	}
 }
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",
diff --git a/example/event/CustomEventFilter.go b/example/event/CustomEventFilter.go
index 9acabf0..989a485 100644
--- a/example/event/CustomEventFilter.go
+++ b/example/event/CustomEventFilter.go
@@ -17,8 +17,8 @@ func GetSenderId(sender tdlib.MessageSender) int64 {
 	}
 }
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",
diff --git a/example/media/Photo_or_Album.go b/example/media/Photo_or_Album.go
index 1bb296e..9873a06 100644
--- a/example/media/Photo_or_Album.go
+++ b/example/media/Photo_or_Album.go
@@ -17,8 +17,8 @@ func GetSenderId(sender tdlib.MessageSender) int64 {
 	}
 }
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",
diff --git a/example/pending/PendingUpdate.go b/example/pending/PendingUpdate.go
index 86d9ef8..e0ec7a1 100644
--- a/example/pending/PendingUpdate.go
+++ b/example/pending/PendingUpdate.go
@@ -9,8 +9,8 @@ import (
 	tdlib "github.com/c0re100/gotdlib/client"
 )
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",
diff --git a/example/raw_update/raw.go b/example/raw_update/raw.go
index 407016f..8fcf134 100644
--- a/example/raw_update/raw.go
+++ b/example/raw_update/raw.go
@@ -17,8 +17,8 @@ func GetSenderId(sender tdlib.MessageSender) int64 {
 	}
 }
 
-func GetTdParameters() *tdlib.TdlibParameters {
-	return &tdlib.TdlibParameters{
+func GetTdParameters() *tdlib.SetTdlibParametersRequest {
+	return &tdlib.SetTdlibParametersRequest{
 		UseTestDc:              false,
 		DatabaseDirectory:      "./tdlib-db",
 		FilesDirectory:         "./tdlib-files",