add preserve submitters order option

app/jobs/process_submitter_completion_job.rb

@@ -4,6 +4,10 @@ class ProcessSubmitterCompletionJob < ApplicationJob
   def perform(submitter)
     is_all_completed = !submitter.submission.submitters.exists?(completed_at: nil)
 
+    if !is_all_completed && submitter.submission.submitters_order_preserved?
+      enqueue_next_submitter_request_notification(submitter)
+    end
+
     Submissions::EnsureResultGenerated.call(submitter)
 
     if submitter.account.encrypted_configs.exists?(key: EncryptedConfig::WEBHOOK_URL_KEY)
@@ -25,8 +29,23 @@ class ProcessSubmitterCompletionJob < ApplicationJob
       SubmitterMailer.completed_email(submitter, user, bcc:).deliver_later!
     end
 
-    to = submitter.submission.submitters.order(:completed_at).select(&:email?).map(&:friendly_name).join(', ')
+    to = submitter.submission.submitters.sort_by(&:completed_at).select(&:email?).map(&:friendly_name).join(', ')
 
     SubmitterMailer.documents_copy_email(submitter, to:).deliver_later! if to.present?
   end
+
+  def enqueue_next_submitter_request_notification(submitter)
+    next_submitter_item =
+      submitter.submission.template_submitters.find do |e|
+        sub = submitter.submission.submitters.find { |s| s.uuid == e['uuid'] }
+
+        sub.completed_at.blank? && sub.sent_at.blank?
+      end
+
+    return unless next_submitter_item
+
+    next_submitter = submitter.submission.submitters.find { |s| s.uuid == next_submitter_item['uuid'] }
+
+    Submitters.send_signature_requests([next_submitter], send_email: true)
+  end
 end

app/jobs/send_submitter_invitation_email_job.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class SendSubmitterInvitationEmailJob < ApplicationJob
+  def perform(submitter)
+    SubmitterMailer.invitation_email(submitter).deliver_now!
+
+    submitter.sent_at ||= Time.current
+    submitter.save
+  end
+end