diff --git a/delete_chat_photo.go b/delete_chat_photo.go
index 77861ec..d5208e9 100644
--- a/delete_chat_photo.go
+++ b/delete_chat_photo.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -10,18 +13,18 @@ import (
 // Note: In regular groups (non-supergroups), this method will only work if the ‘All Members Are Admins’ setting is off in the target group.
 func (bot *Bot) DeleteChatPhoto(chat interface{}) (bool, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("deleteChatPhoto", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/delete_message.go b/delete_message.go
index bb7ee27..38b647a 100644
--- a/delete_message.go
+++ b/delete_message.go
@@ -1,6 +1,7 @@
 package telegram
 
 import (
+	"errors"
 	"strconv"
 
 	json "github.com/pquerna/ffjson/ffjson"
@@ -18,18 +19,18 @@ func (bot *Bot) DeleteMessage(chat interface{}, message int) (bool, error) {
 	var args http.Args
 	args.Add("message_id", strconv.Itoa(message)) // Identifier of the message to delete
 
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("deleteMessage", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/delete_sticker_from_set.go b/delete_sticker_from_set.go
index dabee98..44be654 100644
--- a/delete_sticker_from_set.go
+++ b/delete_sticker_from_set.go
@@ -12,7 +12,7 @@ func (bot *Bot) DeleteStickerFromSet(sticker string) (bool, error) {
 
 	resp, err := bot.post("deleteStickerFromSet", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/export_chat_invite_link.go b/export_chat_invite_link.go
index 6bb4d71..ef445b5 100644
--- a/export_chat_invite_link.go
+++ b/export_chat_invite_link.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,18 +11,18 @@ import (
 // ExportChatInviteLink export an invite link to a supergroup or a channel. The bot must be an administrator in the chat for this to work and must have the appropriate admin rights. Returns exported invite link as String on success.
 func (bot *Bot) ExportChatInviteLink(chat interface{}) (string, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @username)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return "", errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("exportChatInviteLink", &args)
 	if err != nil {
-		return nil, err
+		return "", err
 	}
 
 	var data string
diff --git a/get_chat.go b/get_chat.go
index 5fd55b5..31a1dc4 100644
--- a/get_chat.go
+++ b/get_chat.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,7 +11,7 @@ import (
 // GetChat get up to date information about the chat (current name of the user for one-on-one conversations, current username of a user, group or channel, etc.). Returns a Chat object on success.
 func (bot *Bot) GetChat(chat interface{}) (*Chat, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
diff --git a/get_chat_administrators.go b/get_chat_administrators.go
index ecf9b55..1c1cc7b 100644
--- a/get_chat_administrators.go
+++ b/get_chat_administrators.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,7 +11,7 @@ import (
 // GetChatAdministrators get a list of administrators in a chat. On success, returns an Array of ChatMember objects that contains information about all chat administrators except other bots. If the chat is a group or a supergroup and no administrators were appointed, only the creator will be returned.
 func (bot *Bot) GetChatAdministrators(chat interface{}) (*[]ChatMember, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
diff --git a/get_chat_member.go b/get_chat_member.go
index 9e0fd46..1f40ac4 100644
--- a/get_chat_member.go
+++ b/get_chat_member.go
@@ -13,7 +13,7 @@ func (bot *Bot) GetChatMember(chat interface{}, user int) (*ChatMember, error) {
 	var args http.Args
 	args.Add("user_id", strconv.Itoa(user)) // Unique identifier of the target user
 
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
diff --git a/get_chat_members_count.go b/get_chat_members_count.go
index 502b960..b4ef237 100644
--- a/get_chat_members_count.go
+++ b/get_chat_members_count.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,18 +11,18 @@ import (
 // GetChatMembersCount get the number of members in a chat. Returns Int on success.
 func (bot *Bot) GetChatMembersCount(chat interface{}) (int, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return 0, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.get("getChatMembersCount", &args)
 	if err != nil {
-		return nil, err
+		return 0, err
 	}
 
 	var data int
diff --git a/leave_chat.go b/leave_chat.go
index 821d799..6d13def 100644
--- a/leave_chat.go
+++ b/leave_chat.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,18 +11,18 @@ import (
 // LeaveChat leave a group, supergroup or channel. Returns True on success.
 func (bot *Bot) LeaveChat(chat interface{}) (bool, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("leaveChat", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/send_chat_action.go b/send_chat_action.go
index cd5fa35..89313c2 100644
--- a/send_chat_action.go
+++ b/send_chat_action.go
@@ -28,18 +28,18 @@ func (bot *Bot) SendChatAction(chat interface{}, action string) (bool, error) {
 	var args http.Args
 	args.Add("action", action) // Type of action to broadcast
 
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("sendChatAction", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/set_chat_title.go b/set_chat_title.go
index 730e630..8a2cf60 100644
--- a/set_chat_title.go
+++ b/set_chat_title.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -12,18 +15,18 @@ func (bot *Bot) SetChatTitle(chat interface{}, title string) (bool, error) {
 	var args http.Args
 	args.Add("title", title) // New chat title, 1-255 characters
 
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @channelusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("setChatTitle", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/set_sticker_position_in_set.go b/set_sticker_position_in_set.go
index 5b41160..6020546 100644
--- a/set_sticker_position_in_set.go
+++ b/set_sticker_position_in_set.go
@@ -15,7 +15,7 @@ func (bot *Bot) SetStickerPositionInSet(sticker string, position int) (bool, err
 
 	resp, err := bot.post("setStickerPositionInSet", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/unban_chat_member.go b/unban_chat_member.go
index 920140c..058359c 100644
--- a/unban_chat_member.go
+++ b/unban_chat_member.go
@@ -13,18 +13,18 @@ func (bot *Bot) UnbanChatMember(chat interface{}, user int) (bool, error) {
 	var args http.Args
 	args.Add("user_id", strconv.Itoa(user)) // Unique identifier of the target user
 
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @username)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("unbanChatMember", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool
diff --git a/unpin_chat_message.go b/unpin_chat_message.go
index b01e79e..2dcb37b 100644
--- a/unpin_chat_message.go
+++ b/unpin_chat_message.go
@@ -1,6 +1,9 @@
 package telegram
 
 import (
+	"errors"
+	"strconv"
+
 	json "github.com/pquerna/ffjson/ffjson"
 	http "github.com/valyala/fasthttp"
 )
@@ -8,18 +11,18 @@ import (
 // UnpinChatMessage unpin a message in a supergroup chat. The bot must be an administrator in the chat for this to work and must have the appropriate admin rights. Returns True on success.
 func (bot *Bot) UnpinChatMessage(chat interface{}) (bool, error) {
 	var args http.Args
-	switch id := chatID.(type) {
+	switch id := chat.(type) {
 	case int64: // Unique identifier for the target chat...
 		args.Add("chat_id", strconv.FormatInt(id, 10))
 	case string: // ...or username of the target supergroup or channel (in the format @supergroupusername)
 		args.Add("chat_id", id)
 	default:
-		return nil, errors.New(errorInt64OrString)
+		return false, errors.New(errorInt64OrString)
 	}
 
 	resp, err := bot.post("unpinChatMessage", &args)
 	if err != nil {
-		return nil, err
+		return false, err
 	}
 
 	var data bool