Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/services/whatsapp/send_on_whatsapp_service.rb

@@ -0,0 +1,48 @@
+class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
+  private
+
+  def channel_class
+    Channel::Whatsapp
+  end
+
+  def perform_reply
+    should_send_template_message = template_params.present? || !message.conversation.can_reply?
+    if should_send_template_message
+      send_template_message
+    else
+      send_session_message
+    end
+  end
+
+  def send_template_message
+    processor = Whatsapp::TemplateProcessorService.new(
+      channel: channel,
+      template_params: template_params,
+      message: message
+    )
+
+    name, namespace, lang_code, processed_parameters = processor.call
+
+    if name.blank?
+      message.update!(status: :failed, external_error: 'Template not found or invalid template name')
+      return
+    end
+
+    message_id = channel.send_template(message.conversation.contact_inbox.source_id, {
+                                         name: name,
+                                         namespace: namespace,
+                                         lang_code: lang_code,
+                                         parameters: processed_parameters
+                                       }, message)
+    message.update!(source_id: message_id) if message_id.present?
+  end
+
+  def send_session_message
+    message_id = channel.send_message(message.conversation.contact_inbox.source_id, message)
+    message.update!(source_id: message_id) if message_id.present?
+  end
+
+  def template_params
+    message.additional_attributes && message.additional_attributes['template_params']
+  end
+end