Philip/custom metadata

apps/cic-ussd/cic_ussd/metadata/custom.py

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+# standard imports
+
+# external imports
+
+# local imports
+from .base import MetadataRequestsHandler
+
+
+class CustomMetadata(MetadataRequestsHandler):
+
+    def __init__(self, identifier: bytes):
+        super().__init__(cic_type=':cic.custom', identifier=identifier)

apps/cic-ussd/cic_ussd/metadata/preferences.py

@@ -0,0 +1,12 @@
+# standard imports
+
+# external imports
+
+# local imports
+from .base import MetadataRequestsHandler
+
+
+class PreferencesMetadata(MetadataRequestsHandler):
+
+    def __init__(self, identifier: bytes):
+        super().__init__(cic_type=':cic.preferences', identifier=identifier)