TT#10964 "prepaid" query param for /api/customerbalances

Change-Id: I21fde945992fc00222ab35aca81ddbed4df408a6

lib/NGCP/Panel/Controller/API/CustomerBalances.pm

@@ -83,12 +83,28 @@ sub query_params {
                     { 'domain.domain' => { '=' => $q } };
                 },
                 second => sub {
-                    { join => { voip_subscribers => 'domain' },
+                    {
+                        join => { voip_subscribers => 'domain' },
                         distinct => 1,
                     };
                 },
             },
         },
+        {
+            param => 'prepaid',
+            description => 'Filter for contracts with a prepaid billing profile',
+            query => {
+                first => sub {
+                    my $q = shift;
+                    { 'billing_profile.prepaid' => ($q ? 1 : 0) };
+                },
+                second => sub {
+                    {
+                        join => { billing_mappings_actual => { billing_mappings => 'billing_profile' } },
+                    };
+                },
+            },
+        },
     ];
 }