Add persist invalid, code originally in Spree

For some unknown reason this is not always required, we are adding it
now to handle the capture of the payment after a redirect from Stripe

app/models/spree/payment.rb

@@ -43,13 +43,25 @@ class Payment < ActiveRecord::Base
 
     after_initialize :build_source
 
+
     scope :from_credit_card, -> { where(source_type: 'Spree::CreditCard') }
     scope :with_state, ->(s) { where(state: s.to_s) }
     scope :completed, -> { with_state('completed') }
     scope :pending, -> { with_state('pending') }
     scope :failed, -> { with_state('failed') }
     scope :valid, -> { where('state NOT IN (?)', %w(failed invalid)) }
 
+    # When a payment fails, the order state machine rollbacks all transactions
+    #   Here we ensure we always persist failed and invalid payments
+    after_rollback :persist_invalid
+
+    def persist_invalid
+      return unless ['failed', 'invalid'].include?(state)
+
+      state_will_change!
+      save
+    end
+
     # order state machine (see http://github.com/pluginaweek/state_machine/tree/master for details)
     state_machine initial: :checkout do
       # With card payments, happens before purchase or authorization happens