Create a reflex that handle re-send email confirmation to user

app/reflexes/resend_confirmation_email_reflex.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class ResendConfirmationEmailReflex < ApplicationReflex
+  def confirm(order_ids)
+    Spree::Order.where(id: order_ids).find_each do |o|
+      Spree::OrderMailer.confirm_email_for_customer(o.id, true).deliver_later
+    end
+
+    flash[:success] = I18n.t("admin.resend_confirmation_emails_feedback", count: order_ids.count)
+    cable_ready.dispatch_event(name: "modal:close")
+    morph "#flashes", render(partial: "shared/flashes", locals: { flashes: flash })
+  end
+end

config/locales/en.yml

@@ -1566,6 +1566,10 @@ en:
       stripe_connect_settings:
         resource: Stripe Connect configuration
 
+    resend_confirmation_emails_feedback:
+      one: "Confirmation email sent for 1 order."
+      other: "Confirmation emails sent for %{count} orders."
+
 # API
 #
   api: