diff --git a/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsCommand.php b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsCommand.php
new file mode 100644
index 0000000..6cb00c0
--- /dev/null
+++ b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsCommand.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Domains\Event\Actions\SendMissingPaymentMails;
+
+use App\Mail\ParticipantPaymentMails\ParticipantPaymentMissingPaymentMail;
+use Illuminate\Support\Facades\Mail;
+
+class SendMissingPaymentMailsCommand {
+    function __construct(public SendMissingPaymentMailsRequest $request) {}
+
+    public function execute() : SendMissingPaymentMailsResponse {
+      $response = new SendMissingPaymentMailsResponse();
+
+        foreach ($this->request->eventParticipants->getParticipantsWithMissingPayments($this->request->event, $this->request->httpRequest) as $participant) {
+            $participantResource = $participant->toResource()->toArray($this->request->httpRequest);
+            if (!$participantResource['needs_payment']) {
+                continue;
+            }
+
+            Mail::to($participant->email_1)->send(new ParticipantPaymentMissingPaymentMail(
+                participant: $participant,
+            ));
+
+            if ($participant->email_2 !== null && $participant->email_2 !== $participant->email_1) {
+                Mail::to($participant->email_2)->send(new ParticipantPaymentMissingPaymentMail(
+                    participant: $participant,
+                ));
+            }
+
+            $response->remindedParticipants++;
+        }
+
+        $response->success = true;
+
+        return $response;
+    }
+}
diff --git a/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsRequest.php b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsRequest.php
new file mode 100644
index 0000000..d4e465a
--- /dev/null
+++ b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsRequest.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Domains\Event\Actions\SendMissingPaymentMails;
+
+use App\Models\Event;
+use App\Repositories\EventParticipantRepository;
+use Illuminate\Http\Request;
+
+class SendMissingPaymentMailsRequest {
+    function __construct(
+        public Event $event,
+        public EventParticipantRepository $eventParticipants,
+        public Request $httpRequest
+    ) {
+    }
+}
diff --git a/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsResponse.php b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsResponse.php
new file mode 100644
index 0000000..2818f2f
--- /dev/null
+++ b/app/Domains/Event/Actions/SendMissingPaymentMails/SendMissingPaymentMailsResponse.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Domains\Event\Actions\SendMissingPaymentMails;
+
+class SendMissingPaymentMailsResponse {
+    function __construct(
+        public bool $success = false,
+        public int $remindedParticipants = 0
+    ) {}
+}
diff --git a/app/Domains/Event/Controllers/DetailsController.php b/app/Domains/Event/Controllers/DetailsController.php
index b8037be..fbfac37 100644
--- a/app/Domains/Event/Controllers/DetailsController.php
+++ b/app/Domains/Event/Controllers/DetailsController.php
@@ -22,8 +22,8 @@ use Illuminate\Http\Response;
 use function Symfony\Component\String\b;
 
 class DetailsController extends CommonController {
-    public function __invoke(int $eventId) {
-        $event = $this->events->getById($eventId);
+    public function __invoke(string $eventId) {
+        $event = $this->events->getByIdentifier($eventId);
         return new InertiaProvider('Event/Details', ['event' => $event])->render();
     }
 
diff --git a/app/Domains/Event/Controllers/PaymentReminderController.php b/app/Domains/Event/Controllers/PaymentReminderController.php
new file mode 100644
index 0000000..f85b5f5
--- /dev/null
+++ b/app/Domains/Event/Controllers/PaymentReminderController.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Domains\Event\Controllers;
+
+use App\Domains\Event\Actions\SendMissingPaymentMails\SendMissingPaymentMailsCommand;
+use App\Domains\Event\Actions\SendMissingPaymentMails\SendMissingPaymentMailsRequest;
+use App\Scopes\CommonController;
+use Illuminate\Http\Request;
+
+class PaymentReminderController extends CommonController
+{
+    public function __invoke(string $eventIdentifier, Request $request)
+    {
+        $event = $this->events->getByIdentifier($eventIdentifier, true);
+
+        $sendPaymentReminderMailsRequest = new SendMissingPaymentMailsRequest(
+            event: $event,
+            eventParticipants: $this->eventParticipants,
+            httpRequest: $request
+        );
+
+        $sendPaymentReminderMailsCommand = new SendMissingPaymentMailsCommand(request: $sendPaymentReminderMailsRequest);
+        $sendPaymentReminderResponse = $sendPaymentReminderMailsCommand->execute();
+
+        return response()->json([
+            'success' => $sendPaymentReminderResponse->success,
+            'message' => $sendPaymentReminderResponse->success ?
+                sprintf('Es wurden %1$s Personen über fehlende Teilnahmebeiträge informiert', $sendPaymentReminderResponse->remindedParticipants) :
+                'Beim Senden der Benachrichtigungen ist ein Fehler aufgetreten.',
+
+        ]);
+    }
+}
diff --git a/app/Domains/Event/Routes/api.php b/app/Domains/Event/Routes/api.php
index 8e9e817..8fbfd52 100644
--- a/app/Domains/Event/Routes/api.php
+++ b/app/Domains/Event/Routes/api.php
@@ -9,6 +9,7 @@ use App\Domains\Event\Controllers\ParticipantPaymentController;
 use App\Domains\Event\Controllers\ParticipantReSignOnController;
 use App\Domains\Event\Controllers\ParticipantSignOffController;
 use App\Domains\Event\Controllers\ParticipantUpdateController;
+use App\Domains\Event\Controllers\PaymentReminderController;
 use App\Domains\Event\Controllers\SignupController;
 use App\Middleware\IdentifyTenant;
 use Illuminate\Support\Facades\Route;
@@ -28,6 +29,8 @@ Route::prefix('api/v1')
                        Route::post('/send', SendController::class);
                     });
 
+                    Route::get('{eventIdentifier}/send-payment-reminder', PaymentReminderController::class);
+
                     Route::prefix('/details/{eventId}') ->group(function () {
                         Route::get('/summary', [DetailsController::class, 'summary']);
 
diff --git a/app/Domains/Event/Views/Create.vue b/app/Domains/Event/Views/Create.vue
index 6d62896..2c3c359 100644
--- a/app/Domains/Event/Views/Create.vue
+++ b/app/Domains/Event/Views/Create.vue
@@ -161,17 +161,16 @@
         });
 
         if (data.status !== 'success') {
-            toas.error(data.message);
+            toast.error(data.message);
             return false;
         } else {
-            console.log(data.event);
             newEvent.value = data.event;
             showParticipationFees.value = true;
         }
     }
 
     async function finishCreation() {
-        window.location.href = '/event/details/' + newEvent.value.id;
+        window.location.href = '/event/details/' + newEvent.value.identifier;
     }
 
 
diff --git a/app/Domains/Event/Views/Partials/MailCompose.vue b/app/Domains/Event/Views/Partials/MailCompose.vue
index 6f56e03..cd8a2f0 100644
--- a/app/Domains/Event/Views/Partials/MailCompose.vue
+++ b/app/Domains/Event/Views/Partials/MailCompose.vue
@@ -4,6 +4,7 @@ import {useAjax} from "../../../../../resources/js/components/ajaxHandler.js";
 import TextEditor from "../../../../Views/Components/TextEditor.vue";
 import ErrorText from "../../../../Views/Components/ErrorText.vue";
 import {toast} from "vue3-toastify";
+import InfoText from "../../../../Views/Components/InfoText.vue";
 const { request } = useAjax();
 
 
@@ -37,6 +38,7 @@ onMounted(async () => {
 });
 
 const errorMessage = ref(null)
+const infoMessage = ref(null)
 
 const emit = defineEmits([
     'closeComposer',
@@ -49,6 +51,10 @@ function close() {
 
 
 async function sendMail() {
+    document.getElementById('sendMessageButton').style.display = 'none';
+    infoMessage.value = 'Die Rundmail wird nun gesendet. Dies kann einen Moment dauern. Bitte verlasse diese Seite nicht.'
+
+    toast.info('Die Rundmail wird nun gesendet. Dies kann einen Moment dauern. Bitte verlasse diese Seite nicht.')
     const response = await request('/api/v1/event/' + props.event.identifier + '/mailing/send', {
         method: "POST",
         body: {
@@ -59,10 +65,14 @@ async function sendMail() {
     });
 
     if (response.success) {
+        infoMessage.value = null
+        document.getElementById('sendMessageButton').style.display = 'block';
         close();
         toast.success(response.message)
 
     } else {
+        infoMessage.value = null
+        document.getElementById('sendMessageButton').style.display = 'block';
         errorMessage.value = response.message
         toast.error(response.message)
     }
@@ -94,8 +104,8 @@ const form = reactive({
         <strong><ErrorText :message="errorMessage" /></strong>
 
     </div>
-
-    <input type="button" @click="sendMail" value="Senden" class="" />
+    <info-text :message="infoMessage" />
+    <input type="button" id="sendMessageButton" @click="sendMail" value="Senden" class="" />
 
 </template>
 
diff --git a/app/Domains/Event/Views/Partials/Overview.vue b/app/Domains/Event/Views/Partials/Overview.vue
index 2811c17..22937a1 100644
--- a/app/Domains/Event/Views/Partials/Overview.vue
+++ b/app/Domains/Event/Views/Partials/Overview.vue
@@ -7,6 +7,7 @@
     import Modal from "../../../../Views/Components/Modal.vue";
     import MailCompose from "./MailCompose.vue";
     import FullScreenModal from "../../../../Views/Components/FullScreenModal.vue";
+    import {toast} from "vue3-toastify";
 
     const props = defineProps({
         data: Object,
@@ -54,6 +55,17 @@
     function mailToGroup() {
         mailCompose.value = true
     }
+
+    async function sendPaymentReminder() {
+        toast.info("Die Nachrichten werden gesendet. Bitte verlasse diese Seite nicht.");
+        const response = await fetch("/api/v1/event/" + props.data.event.identifier + "/send-payment-reminder/" );
+        const data = await response.json();
+        if (data.success) {
+            toast.success(data.message)
+        } else {
+            toast.error(data.message)
+        }
+    }
 </script>
 
 <template>
@@ -90,8 +102,8 @@
                 <a :href="'/event/details/' + props.data.event.identifier + '/pdf/photo-permission-list'">
                     <input type="button" value="Foto-Erlaubnis (PDF)" />
                 </a><br/>
-                <input type="button" class="fix-button" value="Zahlungserinnerung senden" /><br/>
-                <input type="button" class="deny-button" value="Letzte Mahnung senden" /><br/>
+                <input type="button" @click="sendPaymentReminder" class="fix-button" value="Zahlungserinnerung senden" /><br/>
+                <input type="button" class="deny-button" value="Letzte Mahnung senden" style="display: none" /><br/>
                 <input type="button" value="Rundmail senden" @click="mailToGroup" /><br/>
             </div>
         </div>
diff --git a/app/Providers/GlobalDataProvider.php b/app/Providers/GlobalDataProvider.php
index 08b7df9..c37a23e 100644
--- a/app/Providers/GlobalDataProvider.php
+++ b/app/Providers/GlobalDataProvider.php
@@ -126,7 +126,7 @@ class GlobalDataProvider {
 
 
                 foreach ($eventRepository->listAll() as $event) {
-                    $navigation['events'][] = ['url' => '/event/details/' . $event->id, 'display' => $event->name];
+                    $navigation['events'][] = ['url' => '/event/details/' . $event->identifier, 'display' => $event->name];
                 }
 
                 $navigation['events'][] = ['url' => '/event/new', 'display' => 'Neue Veranstaltung'];
diff --git a/app/Repositories/EventParticipantRepository.php b/app/Repositories/EventParticipantRepository.php
index 943a052..15b291e 100644
--- a/app/Repositories/EventParticipantRepository.php
+++ b/app/Repositories/EventParticipantRepository.php
@@ -75,6 +75,17 @@ class EventParticipantRepository {
         return $participants;
     }
 
+    public function getParticipantsWithMissingPayments(Event$event, Request $request) : array {
+        $participants = [];
+        foreach ($event->participants()->whereNull('unregistered_at')
+                     ->whereColumn('amount', '<>', 'amount_paid')
+                     ->get() as $participant) {
+            $participants[] = $participant;
+        };
+
+        return $participants;
+    }
+
     public function getParticipantsWithIntolerances(Event $event, Request $request) : array {
         $participants = [];
         foreach ($event->participants()->whereNotNull('intolerances')->whereNot('intolerances' , '=', '')->get() as $participant) {
diff --git a/app/Views/Components/InfoText.vue b/app/Views/Components/InfoText.vue
new file mode 100644
index 0000000..e522106
--- /dev/null
+++ b/app/Views/Components/InfoText.vue
@@ -0,0 +1,10 @@
+<script setup>
+    const props = defineProps({
+        message: String,
+    })
+</script>
+
+<template>
+    <small style="margin-bottom: 20px;" class="info_text" v-if="props.message">{{ props.message }}</small>
+</template>
+
diff --git a/public/css/elements.css b/public/css/elements.css
index a95134e..88a6983 100644
--- a/public/css/elements.css
+++ b/public/css/elements.css
@@ -68,6 +68,12 @@ input[type="submit"]:hover,
     color: #ffffff !important;
 }
 
+.info_text {
+    color: #3369d3;
+    display: block;
+    font-weight: bold;
+}
+
 .error_text {
     color: red;
     display: block;