feat: added support for flow type button

README.md

@@ -90,6 +90,7 @@ Component::video($link);
 Component::text($text);
 Component::urlButton($array_of_urls);
 Component::quickReplyButton($array_of_payloads);
+Component::flowButton($flow_token, $array_of_data);
 ```
 Components supported by Whatsapp template sections:
 

src/Component.php

@@ -46,4 +46,9 @@ public static function quickReplyButton(array $payloads): Component\QuickReplyBu
     {
         return new Component\QuickReplyButton($payloads);
     }
+
+    public static function flowButton(string $token, array $data): Component\FlowButton
+    {
+        return new Component\FlowButton($token, $data);
+    }
 }

src/Component/FlowButton.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace NotificationChannels\WhatsApp\Component;
+
+class FlowButton extends Button
+{
+    public function __construct(?string $token, array $data)
+    {
+        $this->parameters[] = [
+            'type' => 'action',
+            'action' => [
+                'flow_token' => $token,
+                'flow_action_data' => $data,
+            ],
+        ];
+    }
+
+    public function subType(): string
+    {
+        return 'flow';
+    }
+}

tests/Component/FlowButtonTest.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace NotificationChannels\WhatsApp\Test\Component;
+
+use NotificationChannels\WhatsApp\Component\FlowButton;
+use PHPUnit\Framework\TestCase;
+
+final class FlowButtonTest extends TestCase
+{
+    /** @test */
+    public function flow_button_is_valid()
+    {
+        $button = new FlowButton('token', ['test' => 'example']);
+
+        $expectedValue = [
+            'type' => 'button',
+            'sub_type' => 'flow',
+            'index' => '0',
+            'parameters' => [
+                [
+                    'type' => 'action',
+                    'action' => [
+                        'flow_token' => 'token',
+                        'flow_action_data' => [
+                            'test' => 'example',
+                        ],
+                    ],
+                ],
+            ],
+        ];
+
+        $this->assertEquals($expectedValue, $button->toArray());
+    }
+}

tests/ComponentTest.php

@@ -70,4 +70,12 @@ public function it_can_return_a_quick_reply_button_component()
 
         $this->assertInstanceOf(Component\QuickReplyButton::class, $component);
     }
+
+    /** @test */
+    public function it_can_return_a_flow_reply_button_component()
+    {
+        $component = Component::flowButton('token', ['example' => 'test']);
+
+        $this->assertInstanceOf(Component\FlowButton::class, $component);
+    }
 }