remove double call

upsell.html

@@ -407,9 +407,6 @@
                             btn.textContent = "Add 1 Year";
                             btn.disabled = false;
                             btn.classList.add("is-current-plan");
-                            btn.addEventListener("click", function () {
-                                buyProduct("extend-" + meta.productId);
-                            });
                         }
                     } else if (idx < currentIdx) {
                         // Lower tier – hide entirely