diff --git a/.idea/trwl.iml b/.idea/trwl.iml
index d2eeaea44..d2bc5e7d8 100644
--- a/.idea/trwl.iml
+++ b/.idea/trwl.iml
@@ -189,4 +189,4 @@
   <component name="SonarLintModuleSettings">
     <option name="uniqueId" value="7f8bae84-2cb2-4b54-b29d-8b95bcff580f" />
   </component>
-</module>
\ No newline at end of file
+</module>
diff --git a/app/Http/Controllers/API/v1/Controller.php b/app/Http/Controllers/API/v1/Controller.php
index 2a1e42626..e408bdf8e 100644
--- a/app/Http/Controllers/API/v1/Controller.php
+++ b/app/Http/Controllers/API/v1/Controller.php
@@ -10,7 +10,8 @@
  *      title="Träwelling API",
  *      description="Träwelling user API description. This is an incomplete documentation with still many errors. The
  *      API is currently not yet stable. Endpoints are still being restructured. Both the URL and the request or body
- *      can be changed. Breaking changes will be announced on the Discord server: https://discord.gg/72t7564ZbV",
+ *      can be changed. Breaking changes will be announced on GitHub:
+ *      https://github.com/Traewelling/traewelling/blob/develop/API_CHANGELOG.md",
  *      @OA\Contact(
  *          email="support@traewelling.de"
  *      ),
@@ -90,7 +91,11 @@ public function sendResponse(
         int   $code = 200,
         array $additional = null
     ): JsonResponse {
-        $disclaimer = 'APIv1 is not officially released for use and is also not fully documented. You can find the documentation at https://traewelling.de/api/documentation. Use at your own risk. Data fields may change at any time without notice.';
+        $disclaimer = [
+            'message'       => 'APIv1 is not officially released for use and is also not fully documented. Use at your own risk. Data fields may change at any time without notice.',
+            'documentation' => 'https://traewelling.de/api/documentation',
+            'changelog'     => 'https://github.com/Traewelling/traewelling/blob/develop/API_CHANGELOG.md',
+        ];
         if ($data === null) {
             return response()->json(
                 data:   [
diff --git a/app/Http/Controllers/API/v1/StatusController.php b/app/Http/Controllers/API/v1/StatusController.php
index e6dbd080e..952581549 100644
--- a/app/Http/Controllers/API/v1/StatusController.php
+++ b/app/Http/Controllers/API/v1/StatusController.php
@@ -289,9 +289,9 @@ public function getLivePositionForStatus($ids): AnonymousResourceCollection {
      *
      * @param int $id
      *
-     * @return StatusResource|Response
+     * @return StatusResource
      */
-    public function show(int $id): StatusResource|Response {
+    public function show(int $id): StatusResource {
         $status = StatusBackend::getStatus($id);
         try {
             $this->authorize('view', $status);
diff --git a/app/Http/Controllers/StatusController.php b/app/Http/Controllers/StatusController.php
index a80a7fdd4..0b0338477 100644
--- a/app/Http/Controllers/StatusController.php
+++ b/app/Http/Controllers/StatusController.php
@@ -60,22 +60,22 @@ public static function getStatus(int $statusId): Status {
      */
     public static function getActiveStatuses(): ?Collection {
         return Status::with([
-                                     'event', 'likes', 'user.blockedByUsers', 'user.blockedUsers', 'user.followers',
-                                     'checkin.originStation', 'checkin.destinationStation',
-                                     'checkin.Trip.stopovers.station',
-                                     'checkin.Trip.polyline',
-                                 ])
-                          ->whereHas('checkin', function($query) {
-                              $query->where('departure', '<', date('Y-m-d H:i:s'))
-                                    ->where('arrival', '>', date('Y-m-d H:i:s'));
-                          })
-                          ->get()
-                          ->filter(function(Status $status) {
-                              return Gate::allows('view', $status) && !$status->user->shadow_banned && $status->visibility !== StatusVisibility::UNLISTED;
-                          })
-                          ->sortByDesc(function(Status $status) {
-                              return $status->checkin->departure;
-                          })->values();
+                                'event', 'likes', 'user.blockedByUsers', 'user.blockedUsers', 'user.followers',
+                                'checkin.originStation', 'checkin.destinationStation',
+                                'checkin.Trip.stopovers.station',
+                                'checkin.Trip.polyline',
+                            ])
+                     ->whereHas('checkin', function($query) {
+                         $query->where('departure', '<', date('Y-m-d H:i:s'))
+                               ->where('arrival', '>', date('Y-m-d H:i:s'));
+                     })
+                     ->get()
+                     ->filter(function(Status $status) {
+                         return Gate::allows('view', $status) && !$status->user->shadow_banned && $status->visibility !== StatusVisibility::UNLISTED;
+                     })
+                     ->sortByDesc(function(Status $status) {
+                         return $status->checkin->departure;
+                     })->values();
     }
 
     public static function getLivePositions(): array {
@@ -283,7 +283,8 @@ public static function createStatus(
                                   'body'       => $body,
                                   'business'   => $business,
                                   'visibility' => $visibility,
-                                  'event_id'   => $event?->id
+                                  'event_id'   => $event?->id,
+                                  'client_id'  => request()?->user()?->token()?->client?->id,
                               ]);
     }
 }
diff --git a/app/Http/Resources/ClientResource.php b/app/Http/Resources/ClientResource.php
new file mode 100644
index 000000000..ca2087ba2
--- /dev/null
+++ b/app/Http/Resources/ClientResource.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * Model -> OAuthClient
+ */
+class ClientResource extends JsonResource
+{
+    public function toArray($request) {
+        return [
+            'id'               => $this->id,
+            'name'             => $this->name,
+            'privacyPolicyUrl' => $this->privacy_policy_url,
+        ];
+    }
+}
diff --git a/app/Http/Resources/StatusResource.php b/app/Http/Resources/StatusResource.php
index e5fbde6e0..b35d0c272 100644
--- a/app/Http/Resources/StatusResource.php
+++ b/app/Http/Resources/StatusResource.php
@@ -30,22 +30,23 @@ public function toArray($request): array {
             'likes'          => (int) $this->likes->count(),
             'liked'          => (bool) $this->favorited,
             'isLikable'      => Gate::allows('like', $this->resource),
+            'client'         => new ClientResource($this->client),
             'createdAt'      => $this->created_at->toIso8601String(),
             'train'          => [
-                'trip'                => (int) $this->checkin->trip->id,
-                'hafasId'             => (string) $this->checkin->trip->trip_id,
-                'category'            => (string) $this->checkin->trip->category->value,
-                'number'              => (string) $this->checkin->trip->number,
-                'lineName'            => (string) $this->checkin->trip->linename,
-                'journeyNumber'       => $this->checkin->trip->journey_number,
-                'distance'            => (int) $this->checkin->distance,
-                'points'              => (int) $this->checkin->points,
-                'duration'            => (int) $this->checkin->duration,
-                'manualDeparture'     => $this->checkin->manual_departure?->toIso8601String(),
-                'manualArrival'       => $this->checkin->manual_arrival?->toIso8601String(),
-                'origin'              => new StopoverResource($this->checkin->originStopover),
-                'destination'         => new StopoverResource($this->checkin->destinationStopover),
-                'operator'            => new OperatorResource($this?->checkin->trip->operator)
+                'trip'            => (int) $this->checkin->trip->id,
+                'hafasId'         => (string) $this->checkin->trip->trip_id,
+                'category'        => (string) $this->checkin->trip->category->value,
+                'number'          => (string) $this->checkin->trip->number,
+                'lineName'        => (string) $this->checkin->trip->linename,
+                'journeyNumber'   => $this->checkin->trip->journey_number,
+                'distance'        => (int) $this->checkin->distance,
+                'points'          => (int) $this->checkin->points,
+                'duration'        => (int) $this->checkin->duration,
+                'manualDeparture' => $this->checkin->manual_departure?->toIso8601String(),
+                'manualArrival'   => $this->checkin->manual_arrival?->toIso8601String(),
+                'origin'          => new StopoverResource($this->checkin->originStopover),
+                'destination'     => new StopoverResource($this->checkin->destinationStopover),
+                'operator'        => new OperatorResource($this?->checkin->trip->operator)
             ],
             'event'          => new EventResource($this?->event),
         ];
diff --git a/app/Models/Status.php b/app/Models/Status.php
index 6c1959b02..31d607734 100644
--- a/app/Models/Status.php
+++ b/app/Models/Status.php
@@ -16,8 +16,10 @@
  * @property int              user_id
  * @property string           body
  * @property Business         business
- * @property int              event_id
  * @property StatusVisibility visibility
+ * @property int              event_id
+ * @property string           tweet_id
+ * @property string           mastodon_post_id
  * @property Checkin          $checkin
  *
  * @todo merge model with "Checkin" (later only "Checkin") because the difference between trip sources (HAFAS,
@@ -28,7 +30,7 @@ class Status extends Model
 
     use HasFactory;
 
-    protected $fillable = ['user_id', 'body', 'business', 'visibility', 'event_id', 'tweet_id', 'mastodon_post_id'];
+    protected $fillable = ['user_id', 'body', 'business', 'visibility', 'event_id', 'tweet_id', 'mastodon_post_id', 'client_id'];
     protected $hidden   = ['user_id', 'business'];
     protected $appends  = ['favorited', 'socialText', 'statusInvisibleToMe', 'description'];
     protected $casts    = [
@@ -39,6 +41,7 @@ class Status extends Model
         'event_id'         => 'integer',
         'tweet_id'         => 'string',
         'mastodon_post_id' => 'string',
+        'client_id'        => 'integer'
     ];
 
     public function user(): BelongsTo {
@@ -53,6 +56,10 @@ public function checkin(): HasOne {
         return $this->hasOne(Checkin::class);
     }
 
+    public function client(): BelongsTo {
+        return $this->belongsTo(OAuthClient::class, 'client_id', 'id');
+    }
+
     /**
      * @return HasOne
      * @deprecated use ->checkin instead
diff --git a/app/Virtual/Models/Client.php b/app/Virtual/Models/Client.php
new file mode 100644
index 000000000..8a7e72eff
--- /dev/null
+++ b/app/Virtual/Models/Client.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Virtual\Models;
+
+/**
+ * @OA\Schema(
+ *     title="Client",
+ *     description="Client model",
+ *     @OA\Xml(
+ *         name="Client"
+ *     )
+ * )
+ */
+class Client
+{
+    /**
+     * @OA\Property(
+     *     title="ID",
+     *     description="ID",
+     *     format="int64",
+     *     example=39
+     * )
+     *
+     * @var integer
+     */
+    private $id;
+
+    /**
+     * @OA\Property (
+     *     title="name",
+     *     description="Name of client",
+     *     example="Träwelling App"
+     * )
+     *
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @OA\Property (
+     *     title="privacyPolicyUrl",
+     *     description="URL to privacy policy",
+     *     example="https://traewelling.de/privacy-policy"
+     * )
+     *
+     * @var string
+     */
+    private $privacyPolicyUrl;
+}
diff --git a/app/Virtual/Models/Status.php b/app/Virtual/Models/Status.php
index 8b81ce8db..2cb545b75 100644
--- a/app/Virtual/Models/Status.php
+++ b/app/Virtual/Models/Status.php
@@ -137,6 +137,16 @@ class Status
      */
     private $isLikable;
 
+    /**
+     * @OA\Property (
+     *     title="client",
+     *     description="Client model",
+     * )
+     *
+     * @var Client
+     */
+    private $client;
+
     /**
      * @OA\Property (
      *     title="createdAt",
diff --git a/database/migrations/2023_12_29_000000_add_client_id_to_statuses.php b/database/migrations/2023_12_29_000000_add_client_id_to_statuses.php
new file mode 100644
index 000000000..befaacf34
--- /dev/null
+++ b/database/migrations/2023_12_29_000000_add_client_id_to_statuses.php
@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+
+    public function up(): void {
+        Schema::table('statuses', function(Blueprint $table) {
+            $table->unsignedBigInteger('client_id')->nullable()->after('tweet_id');
+            $table->foreign('client_id')->references('id')->on('oauth_clients')->nullOnDelete();
+        });
+    }
+
+    public function down(): void {
+        Schema::table('statuses', function(Blueprint $table) {
+            $table->dropForeign(['client_id']);
+            $table->dropColumn('client_id');
+        });
+    }
+};
diff --git a/resources/views/admin/status/edit.blade.php b/resources/views/admin/status/edit.blade.php
index eb1e8b10c..79f073fc1 100644
--- a/resources/views/admin/status/edit.blade.php
+++ b/resources/views/admin/status/edit.blade.php
@@ -34,11 +34,21 @@
                             @isset($status->checkin->trip->operator?->name)
                                 <small>(Betreiber: {{$status->checkin->trip->operator?->name}})</small>
                             @endisset
-                            <br />
+                            <br/>
                             <a href="{{route('admin.trip.show', ['id' => $status->checkin->trip_id])}}">
                                 {{ $status->checkin->trip_id }}
                             </a>
                         </div>
+
+                        <div class="col-4">
+                            <label>Client</label>
+                        </div>
+                        <div class="col-8">
+                            @isset($status?->client)
+                                {{$status->client->name}} (#{{$status->client->id}})
+                            @endisset
+                        </div>
+
                     </div>
                     <hr/>
                     <form method="POST" action="{{route('admin.status.edit')}}">
diff --git a/storage/api-docs/api-docs.json b/storage/api-docs/api-docs.json
index 03982685a..f8969dd14 100644
--- a/storage/api-docs/api-docs.json
+++ b/storage/api-docs/api-docs.json
@@ -2,7 +2,7 @@
     "openapi": "3.0.0",
     "info": {
         "title": "Träwelling API",
-        "description": "Träwelling user API description. This is an incomplete documentation with still many errors. The\n *      API is currently not yet stable. Endpoints are still being restructured. Both the URL and the request or body\n *      can be changed. Breaking changes will be announced on the Discord server: https://discord.gg/72t7564ZbV",
+        "description": "Träwelling user API description. This is an incomplete documentation with still many errors. The\n *      API is currently not yet stable. Endpoints are still being restructured. Both the URL and the request or body\n *      can be changed. Breaking changes will be announced on GitHub:\n *      https://github.com/Traewelling/traewelling/blob/develop/API_CHANGELOG.md",
         "contact": {
             "email": "support@traewelling.de"
         },
@@ -18,7 +18,7 @@
             "description": "Production Server"
         },
         {
-            "url": "http://localhost:8000/api/v1",
+            "url": "https://traewelling.de/api/v1",
             "description": "This instance"
         }
     ],
@@ -4378,13 +4378,6 @@
                         "type": "integer",
                         "nullable": true
                     },
-                    "tweet": {
-                        "title": "tweet",
-                        "description": "The tweet flag is deprecated and will be removed in a future version. For now, it is ignored and check-ins are not tweeted.",
-                        "type": "boolean",
-                        "example": "false",
-                        "nullable": true
-                    },
                     "toot": {
                         "title": "toot",
                         "description": "Should this status be posted to mastodon?",
@@ -4477,6 +4470,35 @@
                     "name": "CheckinResponse"
                 }
             },
+            "Client": {
+                "title": "Client",
+                "description": "Client model",
+                "properties": {
+                    "id": {
+                        "title": "ID",
+                        "description": "ID",
+                        "type": "integer",
+                        "format": "int64",
+                        "example": 39
+                    },
+                    "name": {
+                        "title": "name",
+                        "description": "Name of client",
+                        "type": "string",
+                        "example": "Träwelling App"
+                    },
+                    "privacyPolicyUrl": {
+                        "title": "privacyPolicyUrl",
+                        "description": "URL to privacy policy",
+                        "type": "string",
+                        "example": "https://traewelling.de/privacy-policy"
+                    }
+                },
+                "type": "object",
+                "xml": {
+                    "name": "Client"
+                }
+            },
             "Event": {
                 "title": "Event",
                 "description": "Event model",
@@ -5072,6 +5094,9 @@
                         "type": "boolean",
                         "example": true
                     },
+                    "client": {
+                        "$ref": "#/components/schemas/Client"
+                    },
                     "createdAt": {
                         "title": "createdAt",
                         "description": "creation date of this status",
@@ -5637,13 +5662,6 @@
                         "type": "boolean",
                         "example": false
                     },
-                    "twitter": {
-                        "title": "twitter",
-                        "description": "Deprecated. Always null, since Träwelling doesn't support twitter anymore.",
-                        "type": "string",
-                        "example": "null",
-                        "nullable": true
-                    },
                     "mastodon": {
                         "title": "mastodon",
                         "description": "Mastodon URL of user",
@@ -5871,9 +5889,9 @@
                 "scheme": "https",
                 "flows": {
                     "authorizationCode": {
-                        "authorizationUrl": "http://localhost/oauth/authorize",
-                        "tokenUrl": "http://localhost/oauth/token",
-                        "refreshUrl": "http://localhost/auth/refresh",
+                        "authorizationUrl": "http://127.0.0.1:8000//oauth/authorize",
+                        "tokenUrl": "http://127.0.0.1:8000//oauth/token",
+                        "refreshUrl": "http://127.0.0.1:8000//auth/refresh",
                         "scopes": {
                             "read-statuses": "see all statuses",
                             "read-notifications": "see your notifications",
diff --git a/tests/Feature/CheckinTest.php b/tests/Feature/CheckinTest.php
index f38d7cd06..6afe9220e 100644
--- a/tests/Feature/CheckinTest.php
+++ b/tests/Feature/CheckinTest.php
@@ -14,6 +14,7 @@
 use App\Models\Trip;
 use App\Models\Station;
 use App\Models\User;
+use App\Providers\AuthServiceProvider;
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -342,4 +343,27 @@ public function testCheckinSuccessFlash(): void {
         $response->assertSee(__('stationboard.where-are-you'), false);
         $response->assertSee(__('menu.developed'), false);
     }
+
+    public function testOauthClientIdIsSavedOnApiCheckins(): void {
+        $this->artisan('passport:install');
+        $this->artisan('passport:keys', ['--no-interaction' => true]);
+
+        $user  = User::factory()->create();
+        $token = $user->createToken('token', array_keys(AuthServiceProvider::$scopes));
+        $trip  = Trip::factory()->create();
+
+        $response = $this->postJson(
+            uri:     '/api/v1/trains/checkin',
+            data:    [
+                         'tripId'      => $trip->trip_id,
+                         'lineName'    => $trip->linename,
+                         'start'       => $trip->originStation->id,
+                         'departure'   => $trip->departure,
+                         'destination' => $trip->destinationStation->id,
+                         'arrival'     => $trip->arrival,
+                     ],
+            headers: ['Authorization' => 'Bearer ' . $token->accessToken],
+        );
+        $this->assertEquals(1, $response->json('data.status.client.id'));
+    }
 }