fix: Duplicate contacts creating for Argentina numbers (#11173)

app/services/whatsapp/incoming_message_service_helpers.rb

@@ -47,6 +47,15 @@ module Whatsapp::IncomingMessageServiceHelpers
     %w[reaction ephemeral unsupported request_welcome].include?(message_type)
   end
 
+  def argentina_phone_number?(phone_number)
+    phone_number.match(/^54/)
+  end
+
+  def normalised_argentina_mobil_number(phone_number)
+    # Remove 9 before country code
+    phone_number.sub(/^549/, '54')
+  end
+
   def processed_waid(waid)
     Whatsapp::PhoneNumberNormalizationService.new(inbox).normalize_and_find_contact(waid)
   end

app/services/whatsapp/phone_normalizers/argentina_phone_normalizer.rb

@@ -0,0 +1,18 @@
+# Handles Argentina phone number normalization
+#
+# Argentina phone numbers can appear with or without "9" after country code
+# This normalizer removes the "9" when present to create consistent format: 54 + area + number
+class Whatsapp::PhoneNormalizers::ArgentinaPhoneNormalizer < Whatsapp::PhoneNormalizers::BasePhoneNormalizer
+  def normalize(waid)
+    return waid unless handles_country?(waid)
+
+    # Remove "9" after country code if present (549 → 54)
+    waid.sub(/^549/, '54')
+  end
+
+  private
+
+  def country_code_pattern
+    /^54/
+  end
+end

app/services/whatsapp/phone_number_normalization_service.rb

@@ -1,5 +1,5 @@
 # Service to handle phone number normalization for WhatsApp messages
-# Currently supports Brazil phone number format variations
+# Currently supports Brazil and Argentina phone number format variations
 # Designed to be extensible for additional countries in future PRs
 #
 # Usage: Whatsapp::PhoneNumberNormalizationService.new(inbox).normalize_and_find_contact(waid)
@@ -34,6 +34,7 @@ class Whatsapp::PhoneNumberNormalizationService
   end
 
   NORMALIZERS = [
-    Whatsapp::PhoneNormalizers::BrazilPhoneNormalizer
+    Whatsapp::PhoneNormalizers::BrazilPhoneNormalizer,
+    Whatsapp::PhoneNormalizers::ArgentinaPhoneNormalizer
   ].freeze
 end