Added placeholder and use default url if not specified

server/notification-providers/whapi.js

@@ -27,7 +27,7 @@ class Whapi extends NotificationProvider {
                 "body": msg,
             };
 
-            let url = notification.whapiApiUrl + "/messages/text";
+            let url = (notification.whapiApiUrl || "https://gate.whapi.cloud/").replace(/\/+$/, "") + "/messages/text";
 
             await axios.post(url, data, config);
 

src/components/notifications/Whapi.vue

@@ -1,7 +1,7 @@
 <template>
     <div class="mb-3">
         <label for="whapi-api-url" class="form-label">{{ $t("API URL") }}</label>
-        <input id="whapi-api-url" v-model="$parent.notification.whapiApiUrl" type="text" class="form-control" required>
+        <input id="whapi-api-url" v-model="$parent.notification.whapiApiUrl" placeholder="https://gate.whapi.cloud/" type="text" class="form-control">
     </div>
 
     <div class="mb-3">