output multiple messages

app/controllers/discourse_donations/charges_controller.rb

@@ -9,19 +9,22 @@ module DiscourseDonations
     def create
       output = { 'messages' => [], 'rewards' => [] }
 
-      if create_account && (email.nil? || email.empty?)
+      if create_account
+        if (email.nil? || email.empty?)
           output['messages'] << 'Please enter your email address'
-      elsif create_account && params[:username].nil?
+        end
+        if params[:username].nil?
           output['messages'] << 'Please enter a username'
-      else
+        end
+      end
+
+      if output['messages'].present?
+        render(:json => output) and return
+      end
+
       payment = DiscourseDonations::Stripe.new(secret_key, stripe_options)
       charge = payment.charge(email, params)
       output['messages'] = [charge['outcome']['seller_message']]
-      end
-
-      if payment.nil?
-        render(:json => output) and return
-      end
 
       if reward?(payment)
         if current_user.present?