feat: Remove subscription on WhatsApp inbox delete (#11977)

- remove webhook subscription while deleting a whatsapp inbox created
via embedded signup

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/services/whatsapp/facebook_api_client.rb

@@ -63,6 +63,15 @@ class Whatsapp::FacebookApiClient
     handle_response(response, 'Webhook subscription failed')
   end
 
+  def unsubscribe_waba_webhook(waba_id)
+    response = HTTParty.delete(
+      "#{BASE_URI}/#{@api_version}/#{waba_id}/subscribed_apps",
+      headers: request_headers
+    )
+
+    handle_response(response, 'Webhook unsubscription failed')
+  end
+
   private
 
   def request_headers

app/services/whatsapp/webhook_teardown_service.rb

@@ -0,0 +1,47 @@
+class Whatsapp::WebhookTeardownService
+  def initialize(channel)
+    @channel = channel
+  end
+
+  def perform
+    return unless should_teardown_webhook?
+
+    teardown_webhook
+  rescue StandardError => e
+    handle_webhook_teardown_error(e)
+  end
+
+  private
+
+  def should_teardown_webhook?
+    whatsapp_cloud_provider? && embedded_signup_source? && webhook_config_present?
+  end
+
+  def whatsapp_cloud_provider?
+    @channel.provider == 'whatsapp_cloud'
+  end
+
+  def embedded_signup_source?
+    @channel.provider_config['source'] == 'embedded_signup'
+  end
+
+  def webhook_config_present?
+    @channel.provider_config['business_account_id'].present? &&
+      @channel.provider_config['api_key'].present?
+  end
+
+  def teardown_webhook
+    waba_id = @channel.provider_config['business_account_id']
+    access_token = @channel.provider_config['api_key']
+    api_client = Whatsapp::FacebookApiClient.new(access_token)
+
+    api_client.unsubscribe_waba_webhook(waba_id)
+    Rails.logger.info "[WHATSAPP] Webhook unsubscribed successfully for channel #{@channel.id}"
+  end
+
+  def handle_webhook_teardown_error(error)
+    Rails.logger.error "[WHATSAPP] Webhook teardown failed: #{error.message}"
+    # Don't raise the error to prevent channel deletion from failing
+    # Failed webhook teardown shouldn't block deletion
+  end
+end