diff --git a/rattail_corepos/importing/corepos/api.py b/rattail_corepos/importing/corepos/api.py
index b080d8c..241dd5c 100644
--- a/rattail_corepos/importing/corepos/api.py
+++ b/rattail_corepos/importing/corepos/api.py
@@ -480,10 +480,10 @@ class MemberImporter(FromCOREPOSAPI, importing.model.MemberImporter):
     """
     Importer for member data from CORE POS API.
     """
-    key = 'id'
+    key = 'number'
     supported_fields = [
-        'id',
         'number',
+        'id',
         'customer_uuid',
         'joined',
         'withdrew',
@@ -548,8 +548,8 @@ class MemberImporter(FromCOREPOSAPI, importing.model.MemberImporter):
             withdrew = withdrew.date()
 
         return {
-            'id': str(member['cardNo']),
             'number': int(member['cardNo']),
+            'id': str(member['customerAccountID']),
             'customer_uuid': customer.uuid,
             'joined': joined,
             'withdrew': withdrew,