Fixes for Button elements

src/Blockkit/Blocks/Elements/Button.php

@@ -42,13 +42,6 @@ final class Button extends Element
 
 	/* OPTIONAL ITEMS */
 
-	public function callback_id(string $string): self
-	{
-		$this->callback_id = $string;
-
-		return $this;
-	}
-
 	public function confirm(Confirm $confirm): self
 	{
 		$this->confirm = $confirm;

src/Interactive/BlockActions.php

@@ -113,6 +113,8 @@ final class BlockActions extends Base
 
 			case 'value':
 				switch (object_get($this->action,'type')) {
+					case 'button':
+						return object_get($this->action,'text.text');
 					case 'external_select':
 					case 'overflow':
 					case 'static_select':