use a named argument for offline param

app/jobs/subscription_confirm_job.rb

@@ -62,7 +62,7 @@ class SubscriptionConfirmJob
     return unless order.payment_required?
 
     prepare_for_payment!(order)
-    order.process_payments!(true)
+    order.process_payments!(offline: true)
     raise if order.errors.any?
   end
 

app/models/spree/order.rb

@@ -499,7 +499,7 @@ module Spree
     #   which gets rescued and converted to FALSE when
     #   :allow_checkout_on_gateway_error is set to false
     #
-    def process_payments!(offline = false)
+    def process_payments!(offline: false)
       raise Core::GatewayError, Spree.t(:no_pending_payments) if pending_payments.empty?
 
       pending_payments.each do |payment|