feat: support reply to for outgoing message in WhatsApp (#8107)

- This PR enables replies to WhatsApp.

spec/services/whatsapp/providers/whatsapp_cloud_service_spec.rb

@@ -3,8 +3,18 @@ require 'rails_helper'
 describe Whatsapp::Providers::WhatsappCloudService do
   subject(:service) { described_class.new(whatsapp_channel: whatsapp_channel) }
 
+  let(:conversation) { create(:conversation, inbox: whatsapp_channel.inbox) }
   let(:whatsapp_channel) { create(:channel_whatsapp, provider: 'whatsapp_cloud', validate_provider_config: false, sync_templates: false) }
-  let(:message) { create(:message, message_type: :outgoing, content: 'test', inbox: whatsapp_channel.inbox) }
+
+  let(:message) do
+    create(:message, conversation: conversation, message_type: :outgoing, content: 'test', inbox: whatsapp_channel.inbox, source_id: 'external_id')
+  end
+
+  let(:message_with_reply) do
+    create(:message, conversation: conversation, message_type: :outgoing, content: 'reply', inbox: whatsapp_channel.inbox,
+                     content_attributes: { in_reply_to: message.id })
+  end
+
   let(:response_headers) { { 'Content-Type' => 'application/json' } }
   let(:whatsapp_response) { { messages: [{ id: 'message_id' }] } }
 
@@ -19,6 +29,7 @@ describe Whatsapp::Providers::WhatsappCloudService do
           .with(
             body: {
               messaging_product: 'whatsapp',
+              context: nil,
               to: '+123456789',
               text: { body: message.content },
               type: 'text'
@@ -28,6 +39,23 @@ describe Whatsapp::Providers::WhatsappCloudService do
         expect(service.send_message('+123456789', message)).to eq 'message_id'
       end
 
+      it 'calls message endpoints for a reply to messages' do
+        stub_request(:post, 'https://graph.facebook.com/v13.0/123456789/messages')
+          .with(
+            body: {
+              messaging_product: 'whatsapp',
+              context: {
+                message_id: message.source_id
+              },
+              to: '+123456789',
+              text: { body: message_with_reply.content },
+              type: 'text'
+            }.to_json
+          )
+          .to_return(status: 200, body: whatsapp_response.to_json, headers: response_headers)
+        expect(service.send_message('+123456789', message_with_reply)).to eq 'message_id'
+      end
+
       it 'calls message endpoints for image attachment message messages' do
         attachment = message.attachments.new(account_id: message.account_id, file_type: :image)
         attachment.file.attach(io: Rails.root.join('spec/assets/avatar.png').open, filename: 'avatar.png', content_type: 'image/png')