diff --git a/types/payment/index.d.ts b/types/payment/index.d.ts
index fbd3f5ba65..7a1426e7d6 100644
--- a/types/payment/index.d.ts
+++ b/types/payment/index.d.ts
@@ -11,6 +11,10 @@ interface Fns {
      * * Validates length
      */
     validateCardNumber(cardNumber: string): boolean;
+    /**
+     * Formats a card number
+     */
+    formatCardNumber(cardNumber: string): string;
     /**
      * Validates a card expiry:
      * * Validates numbers