Merge branch 'main' of github.com:Expensify/App into feat/step-3-ui

src/libs/ValidationUtils.ts

@@ -20,9 +20,14 @@ import StringUtils from './StringUtils';
  */
 function validateCardNumber(value: string): boolean {
     let sum = 0;
-    for (let i = 0; i < value.length; i++) {
-        let intVal = parseInt(value.slice(i, i + 1), 10);
-        if (i % 2 === 0) {
+    let shouldDouble = false;
+
+    // Loop through the card number from right to left
+    for (let i = value.length - 1; i >= 0; i--) {
+        let intVal = parseInt(value[i], 10);
+
+        // Double every second digit from the right
+        if (shouldDouble) {
             intVal *= 2;
             if (intVal > 9) {
                 intVal -= 9;