diff --git a/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm b/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
index 00d3b636a5..1f23fc8fa7 100644
--- a/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
+++ b/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
@@ -46,10 +46,20 @@ has_field 'ratio' => (
     },
 );
 
+has_field 'external_id' => (
+    type => 'Text',
+    label => 'External ID',
+    required => 0,
+    element_attr => {
+        rel => ['tooltip'],
+        title => ['A non-unique external ID e.g., provided by a 3rd party provisioning']
+    },
+);
+
 has_block 'fields' => (
     tag => 'div',
     class => [qw/modal-body/],
-    render_list => [qw/cash_balance cash_debit free_time_balance free_time_spent ratio/],
+    render_list => [qw/cash_balance cash_debit free_time_balance free_time_spent ratio external_id/],
 );
 
 1;
diff --git a/lib/NGCP/Panel/Role/API/CustomerBalances.pm b/lib/NGCP/Panel/Role/API/CustomerBalances.pm
index 2dcbe00a9a..0b27e50e6b 100644
--- a/lib/NGCP/Panel/Role/API/CustomerBalances.pm
+++ b/lib/NGCP/Panel/Role/API/CustomerBalances.pm
@@ -83,6 +83,7 @@ sub resource_from_item{
     my %resource = $item->get_inflated_columns;
     #$resource{cash_balance} /= 100.0;
     ##$resource{cash_balance_interval} /= 100.0;
+    $resource{external_id} = $item->contract->external_id if $item->contract->external_id;
     $resource{cash_balance} /= 100.0;
     $resource{cash_debit} = (delete $resource{cash_balance_interval}) / 100.0;
     $resource{free_time_spent} = delete $resource{free_time_balance_interval};