feat: fold purchase and promo voucher fields into one code field

config/services.yaml

@@ -16,6 +16,12 @@ parameters:
     default_email_to: '%env(APP_DEFAULT_EMAIL_TO)%'
     accommodation_inquiry_email: '%env(ACCOMMODATION_INQUIRY_EMAIL)%'
     role_nomination_notification_emails: '%env(csv:APP_ROLE_NOMINATION_EMAILS)%'
+    # Promo codes issued before the "R-" prefix was introduced, with the last day each is recognised
+    # as a promo code (VoucherCodeClassifier). Remove this parameter and the classifier branch
+    # reading it once the last date has passed.
+    # TODO: replace the placeholder with the codes still active in BusPro (GutscheinAktion).
+    legacy_promo_voucher_codes:
+        PLACEHOLDER: '2027-04-30'
 
     # MailJet list ids and their labels
     mailjet_lists:
@@ -242,6 +248,10 @@ services:
             $cache: '@cache.app'
             $logger: '@monolog.logger.bpn'
 
+    App\Service\VoucherCodeClassifier:
+        arguments:
+            $legacyPromoCodes: '%legacy_promo_voucher_codes%'
+
     # Voucher purchase flow (/gutschein)
     App\Service\VoucherTemplateProvider:
         arguments:
@@ -265,8 +275,7 @@ services:
     App\Form\Service\ParticipantInsuranceFieldHandler: ~
     App\Form\Service\ParticipantBulkInsuranceFieldHandler: ~
     App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler: ~
-    App\Form\Service\ParticipantPurchaseVoucherFieldHandler: ~
-    App\Form\Service\ParticipantPromoVoucherFieldHandler: ~
+    App\Form\Service\ParticipantVoucherFieldHandler: ~
 
     # Participant Field Handler Registry - most handlers instantiate dependencies directly, some use services
     App\Form\Service\ParticipantFieldHandlerRegistry:
@@ -292,8 +301,7 @@ services:
                 - '@App\Form\Service\ParticipantTransportationDiscountReplacementFieldHandler'
                 - '@App\Form\Service\ParticipantBulkInsuranceFieldHandler'
                 - '@App\Form\Service\ParticipantInsuranceFieldHandler'
-                - '@App\Form\Service\ParticipantPurchaseVoucherFieldHandler'
-                - '@App\Form\Service\ParticipantPromoVoucherFieldHandler'
+                - '@App\Form\Service\ParticipantVoucherFieldHandler'
                 - '@App\Form\Service\ParticipantParkingFieldHandler'
 
     # Booking Status Rules