Add custom_emoji_sticker_set_name field and getter

to the `PublicChatSupergroup` struct

crates/teloxide-core/src/types/chat.rs

@@ -197,6 +197,13 @@ pub struct PublicChatSupergroup {
     /// [`GetChat`]: crate::payloads::GetChat
     pub can_set_sticker_set: Option<bool>,
 
+    /// For supergroups, the name of the group's custom emoji sticker set.
+    /// Custom emoji from this set can be used by all users and bots in the
+    /// group. Returned only from [`GetChat`].
+    ///
+    /// [`GetChat`]: crate::payloads::GetChat
+    pub custom_emoji_sticker_set_name: Option<String>,
+
     /// A default chat member permissions, for groups and supergroups.
     /// Returned only from [`GetChat`].
     ///
@@ -362,6 +369,22 @@ impl Chat {
         None
     }
 
+    /// For supergroups, the name of the group's custom emoji sticker set.
+    /// Custom emoji from this set can be used by all users and bots in the
+    /// group. Returned only from [`GetChat`].
+    ///
+    /// [`GetChat`]: crate::payloads::GetChat
+    #[must_use]
+    pub fn custom_emoji_sticker_set_name(&self) -> Option<&str> {
+        if let ChatKind::Public(this) = &self.kind {
+            if let PublicChatKind::Supergroup(this) = &this.kind {
+                return this.custom_emoji_sticker_set_name.as_deref();
+            }
+        }
+
+        None
+    }
+
     /// The minimum allowed delay between consecutive messages sent by each
     /// unpriviledged user. Returned only from [`GetChat`].
     ///

crates/teloxide-core/src/types/message.rs

@@ -2114,6 +2114,7 @@ mod tests {
                     username: None,
                     sticker_set_name: None,
                     can_set_sticker_set: None,
+                    custom_emoji_sticker_set_name: None,
                     permissions: None,
                     slow_mode_delay: None,
                     unrestrict_boost_count: None,

crates/teloxide-core/src/types/story.rs

@@ -52,6 +52,7 @@ mod tests {
                         is_forum: false,
                         sticker_set_name: None,
                         can_set_sticker_set: None,
+                        custom_emoji_sticker_set_name: None,
                         permissions: None,
                         slow_mode_delay: None,
                         unrestrict_boost_count: None,

crates/teloxide-core/src/types/update.rs

@@ -870,6 +870,7 @@ mod test {
                             is_forum: false,
                             sticker_set_name: None,
                             can_set_sticker_set: None,
+                            custom_emoji_sticker_set_name: None,
                             permissions: None,
                             slow_mode_delay: None,
                             unrestrict_boost_count: None,