diff --git a/apps/web/modules/settings/billing/billing-view.tsx b/apps/web/modules/settings/billing/billing-view.tsx
index ea0bad02152c5e..900c699104278a 100644
--- a/apps/web/modules/settings/billing/billing-view.tsx
+++ b/apps/web/modules/settings/billing/billing-view.tsx
@@ -14,6 +14,16 @@ interface CtaRowProps {
   className?: string;
 }
 
+declare global {
+  interface Window {
+    Plain?: {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      init: (config: any) => void;
+      open: () => void;
+    };
+  }
+}
+
 export const CtaRow = ({ title, description, className, children }: CtaRowProps) => {
   return (
     <>
diff --git a/apps/web/modules/settings/platform/billing/billing-view.tsx b/apps/web/modules/settings/platform/billing/billing-view.tsx
index 6df9e0831b1df5..5506597f96157b 100644
--- a/apps/web/modules/settings/platform/billing/billing-view.tsx
+++ b/apps/web/modules/settings/platform/billing/billing-view.tsx
@@ -13,6 +13,16 @@ import { useGetUserAttributes } from "@components/settings/platform/hooks/useGet
 
 import { CtaRow } from "~/settings/billing/billing-view";
 
+declare global {
+  interface Window {
+    Plain?: {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      init: (config: any) => void;
+      open: () => void;
+    };
+  }
+}
+
 export default function PlatformBillingUpgrade() {
   const pathname = usePathname();
   const { t } = useLocale();