diff --git a/frontend_tests/node_tests/billing_helpers.js b/frontend_tests/node_tests/billing_helpers.js
index a6d4176580..d7eaaf1dbe 100644
--- a/frontend_tests/node_tests/billing_helpers.js
+++ b/frontend_tests/node_tests/billing_helpers.js
@@ -127,7 +127,7 @@ run_test('create_ajax_request', () => {
         assert.equal(state.form_input_section_show, 1);
     };
 
-    helpers.create_ajax_request("/json/billing/upgrade", "autopay", {id: "stripe_token_id"});
+    helpers.create_ajax_request("/json/billing/upgrade", "autopay", {id: "stripe_token_id"}, ["licenses"]);
 
 });
 
diff --git a/static/js/billing/billing.js b/static/js/billing/billing.js
index d9e0c699b6..15e1978ae6 100644
--- a/static/js/billing/billing.js
+++ b/static/js/billing/billing.js
@@ -7,7 +7,7 @@ exports.initialize = function () {
         image: '/static/images/logo/zulip-icon-128x128.png',
         locale: 'auto',
         token: function (stripe_token) {
-            helpers.create_ajax_request("/json/billing/sources/change", "cardchange", stripe_token = stripe_token);
+            helpers.create_ajax_request("/json/billing/sources/change", "cardchange", stripe_token);
         },
     });
 
diff --git a/static/js/billing/helpers.js b/static/js/billing/helpers.js
index 41ec4a3def..ff874273dc 100644
--- a/static/js/billing/helpers.js
+++ b/static/js/billing/helpers.js
@@ -1,4 +1,4 @@
-exports.create_ajax_request = function (url, form_name, stripe_token = null) {
+exports.create_ajax_request = function (url, form_name, stripe_token = null, numeric_inputs = []) {
     const form = $("#" + form_name + "-form");
     const form_loading_indicator = "#" + form_name + "_loading_indicator";
     const form_input_section = "#" + form_name + "-input-section";
@@ -6,8 +6,6 @@ exports.create_ajax_request = function (url, form_name, stripe_token = null) {
     const form_error = "#" + form_name + "-error";
     const form_loading = "#" + form_name + "-loading";
 
-    const numeric_inputs = ["licenses"];
-
     loading.make_indicator($(form_loading_indicator),
                            {text: 'Processing ...', abs_positioned: true});
     $(form_input_section).hide();
diff --git a/static/js/billing/upgrade.js b/static/js/billing/upgrade.js
index d8d45cf3c3..0262d0e5e3 100644
--- a/static/js/billing/upgrade.js
+++ b/static/js/billing/upgrade.js
@@ -6,7 +6,7 @@ exports.initialize = () => {
         image: '/static/images/logo/zulip-icon-128x128.png',
         locale: 'auto',
         token: function (stripe_token) {
-            helpers.create_ajax_request("/json/billing/upgrade", "autopay", stripe_token = stripe_token);
+            helpers.create_ajax_request("/json/billing/upgrade", "autopay", stripe_token, ["licenses"]);
         },
     });
 
@@ -33,7 +33,7 @@ exports.initialize = () => {
             return;
         }
         e.preventDefault();
-        helpers.create_ajax_request("/json/billing/upgrade", "invoice");
+        helpers.create_ajax_request("/json/billing/upgrade", "invoice", undefined, ["licenses"]);
     });
 
     const prices = {};