Add some content to payment page

assets/pages/index.html

@@ -56,7 +56,7 @@
                 }
             })
             .catch(error => {
-                console.error("Error:", error);
+                console.error(error);
             });
     });
 

assets/pages/payment.html

@@ -24,6 +24,8 @@
 
 <main>
     <h1>Payment page</h1>
+    <input id="amount-input" placeholder="Amount">
+    <button>Pay</button>
 </main>
 
 <script>