diff --git a/core/models/BaseProfile.py b/core/models/BaseProfile.py
index 0150e33..b64dc4c 100644
--- a/core/models/BaseProfile.py
+++ b/core/models/BaseProfile.py
@@ -96,25 +96,28 @@ class BaseProfile:
 
     @staticmethod
     def exists(id: int):
-        return os.path.isdir(BaseProfile.__get_config_path(id)) and re.match(r'^\d+$', str(id))
+        return re.match(r'^\d{1,2}$', str(id)) and os.path.isfile(f'{BaseProfile.__get_config_path(id)}/config.json')
 
     @staticmethod
     def all():
 
         profiles = {}
 
-        for id in map(int, sorted(os.listdir(Constants.SP_PROFILE_CONFIG_HOME))):
+        for directory_entry in os.listdir(Constants.SP_PROFILE_CONFIG_HOME):
+
+            try:
+                id = int(directory_entry)
+            except ValueError:
+                continue
 
             if BaseProfile.exists(id):
 
-                if os.path.exists(f'{BaseProfile.__get_config_path(id)}/config.json'):
+                profile = BaseProfile.find_by_id(id)
 
-                    profile = BaseProfile.find_by_id(id)
+                if profile is not None:
+                    profiles[id] = profile
 
-                    if profile is not None:
-                        profiles[id] = profile
-
-        return profiles
+        return dict(sorted(profiles.items()))
 
     @staticmethod
     def save(profile):
diff --git a/core/models/Subscription.py b/core/models/Subscription.py
index 1139d07..5211690 100644
--- a/core/models/Subscription.py
+++ b/core/models/Subscription.py
@@ -21,6 +21,9 @@ class Subscription:
         )
     )
 
+    def get_sanitized_billing_code(self):
+        return '-'.join(['****'] * 3 + [self.billing_code[-4:]])
+
     def has_been_activated(self):
         return self.expires_at is not None
 
diff --git a/core/models/session/SessionProfile.py b/core/models/session/SessionProfile.py
index 7a1b665..af60d20 100644
--- a/core/models/session/SessionProfile.py
+++ b/core/models/session/SessionProfile.py
@@ -60,7 +60,7 @@ class SessionProfile(BaseProfile):
         return proxy_configuration
 
     def has_proxy_configuration(self):
-        return os.path.exists(f'{self.get_config_path()}/proxy.json')
+        return os.path.isfile(f'{self.get_config_path()}/proxy.json')
 
     def has_wireguard_configuration(self):
-        return os.path.exists(f'{self.get_config_path()}/wg.conf')
+        return os.path.isfile(f'{self.get_config_path()}/wg.conf')
diff --git a/core/models/system/SystemProfile.py b/core/models/system/SystemProfile.py
index 979a5db..105e9fb 100644
--- a/core/models/system/SystemProfile.py
+++ b/core/models/system/SystemProfile.py
@@ -45,7 +45,7 @@ class SystemProfile(BaseProfile):
         return f'{self.get_system_config_path()}/wg.conf'
 
     def has_wireguard_configuration(self):
-        return os.path.exists(f'{self.get_system_config_path()}/wg.conf')
+        return os.path.isfile(f'{self.get_system_config_path()}/wg.conf')
 
     def delete(self):
 
diff --git a/main.py b/main.py
index 16968ef..0bc9952 100644
--- a/main.py
+++ b/main.py
@@ -20,7 +20,7 @@ from core.observers.ConnectionObserver import ConnectionObserver
 from core.observers.InvoiceObserver import InvoiceObserver
 from core.observers.ProfileObserver import ProfileObserver
 from pathlib import Path
-from typing import Optional
+from typing import Optional, Union
 import argparse
 import pprint
 import re
@@ -44,10 +44,10 @@ if __name__ == '__main__':
     invoice_observer.subscribe('processing', lambda event: print('A payment has been detected and is being verified...\n'))
     invoice_observer.subscribe('settled', lambda event: print('The payment has been successfully verified.\n'))
 
-    profile_observer.subscribe('created', lambda event: pprint.pp((event.subject, 'Created')))
-    profile_observer.subscribe('destroyed', lambda event: pprint.pp((event.subject, 'Destroyed')))
-    profile_observer.subscribe('disabled', lambda event: pprint.pp((event.subject, 'Disabled')) if event.meta.get('explicitly') else None)
-    profile_observer.subscribe('enabled', lambda event: pprint.pp((event.subject, 'Enabled')))
+    profile_observer.subscribe('created', lambda event: pprint.pp((__sanitize_profile(event.subject), 'Created')))
+    profile_observer.subscribe('destroyed', lambda event: pprint.pp((__sanitize_profile(event.subject), 'Destroyed')))
+    profile_observer.subscribe('disabled', lambda event: pprint.pp((__sanitize_profile(event.subject), 'Disabled')) if event.meta.get('explicitly') else None)
+    profile_observer.subscribe('enabled', lambda event: pprint.pp((__sanitize_profile(event.subject), 'Enabled')))
 
     def __parse_application_string(application_string: Optional[str] = None):
 
@@ -61,6 +61,15 @@ if __name__ == '__main__':
         else:
             return parsed_application_string.groupdict()
 
+    def __sanitize_profile(candidate: Optional[Union[SessionProfile, SystemProfile]]):
+
+        if candidate is not None and candidate.has_subscription():
+
+            sanitized_billing_code = candidate.subscription.get_sanitized_billing_code()
+            candidate.subscription.billing_code = sanitized_billing_code
+
+        return candidate
+
     pristine_parser = argparse.ArgumentParser(add_help=False)
     pristine_parser.add_argument('--pristine', '-p', action='store_true')
 
@@ -144,7 +153,13 @@ if __name__ == '__main__':
             profile_parser.print_help()
 
         elif arguments.subcommand == 'list':
-            pprint.pp(ProfileController.get_all())
+
+            profiles = ProfileController.get_all()
+
+            for key, value in profiles.items():
+                profiles[key] = __sanitize_profile(value)
+
+            pprint.pp(profiles)
 
         elif arguments.subcommand == 'show':
             pprint.pp(ProfileController.get(arguments.id))