diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/Commands/ChangePlan.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/Commands/ChangePlan.cs
index 9d3424211..28351c602 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/Commands/ChangePlan.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/Commands/ChangePlan.cs
@@ -12,7 +12,5 @@ namespace Squidex.Domain.Apps.Entities.Apps.Commands
         public bool FromCallback { get; set; }
 
         public string PlanId { get; set; }
-
-        public string Referer { get; set; }
     }
 }
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/DomainObject/AppDomainObject.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/DomainObject/AppDomainObject.cs
index 7294e3786..f1dc9a1c4 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/DomainObject/AppDomainObject.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/DomainObject/AppDomainObject.cs
@@ -258,7 +258,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                 case DeleteApp delete:
                     return UpdateAsync(delete, async (c, ct) =>
                     {
-                        await Billing().SubscribeAsync(c.Actor.Identifier, Snapshot.NamedId(), null, null, ct);
+                        await Billing().UnsubscribeAsync(c.Actor.Identifier, Snapshot.NamedId(), default);
 
                         DeleteApp(c);
                     }, ct);
@@ -290,7 +290,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
 
                 if (!c.FromCallback)
                 {
-                    var redirectUri = await Billing().MustRedirectToPortalAsync(userId, Snapshot.NamedId(), c.PlanId, c.Referer, default);
+                    var redirectUri = await Billing().MustRedirectToPortalAsync(userId, Snapshot.NamedId(), c.PlanId, default);
 
                     if (redirectUri != null)
                     {
@@ -310,11 +310,11 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
 
             if (result.Payload is PlanChangedResult { Unsubscribed: true, RedirectUri: null })
             {
-                await Billing().UnsubscribeAsync(userId, Snapshot.NamedId(), changePlan.Referer, default);
+                await Billing().UnsubscribeAsync(userId, Snapshot.NamedId(), default);
             }
             else if (result.Payload is PlanChangedResult { RedirectUri: null })
             {
-                await Billing().SubscribeAsync(userId, Snapshot.NamedId(), changePlan.PlanId, changePlan.Referer);
+                await Billing().SubscribeAsync(userId, Snapshot.NamedId(), changePlan.PlanId, default);
             }
 
             return result;
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/IAppPlanBillingManager.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/IAppPlanBillingManager.cs
index 306ec6de8..963f935a5 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/IAppPlanBillingManager.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/IAppPlanBillingManager.cs
@@ -13,13 +13,13 @@ namespace Squidex.Domain.Apps.Entities.Apps.Plans
     {
         bool HasPortal { get; }
 
-        Task<Uri?> MustRedirectToPortalAsync(string userId, NamedId<DomainId> appId, string? planId, string? referer,
+        Task<Uri?> MustRedirectToPortalAsync(string userId, NamedId<DomainId> appId, string? planId,
             CancellationToken ct = default);
 
-        Task SubscribeAsync(string userId, NamedId<DomainId> appId, string? planId, string? referer,
+        Task SubscribeAsync(string userId, NamedId<DomainId> appId, string planId,
             CancellationToken ct = default);
 
-        Task UnsubscribeAsync(string userId, NamedId<DomainId> appId, string? referer,
+        Task UnsubscribeAsync(string userId, NamedId<DomainId> appId,
             CancellationToken ct = default);
 
         Task<string> GetPortalLinkAsync(string userId,
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/NoopAppPlanBillingManager.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/NoopAppPlanBillingManager.cs
index 8063166fb..2a3d22307 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/NoopAppPlanBillingManager.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/Plans/NoopAppPlanBillingManager.cs
@@ -22,19 +22,19 @@ namespace Squidex.Domain.Apps.Entities.Apps.Plans
             return Task.FromResult(string.Empty);
         }
 
-        public Task<Uri?> MustRedirectToPortalAsync(string userId, NamedId<DomainId> appId, string? planId, string? referer,
+        public Task<Uri?> MustRedirectToPortalAsync(string userId, NamedId<DomainId> appId, string? planId,
             CancellationToken ct = default)
         {
             return Task.FromResult<Uri?>(null);
         }
 
-        public Task SubscribeAsync(string userId, NamedId<DomainId> appId, string? planId, string? referer,
+        public Task SubscribeAsync(string userId, NamedId<DomainId> appId, string planId,
             CancellationToken ct = default)
         {
             return Task.CompletedTask;
         }
 
-        public Task UnsubscribeAsync(string userId, NamedId<DomainId> appId, string? referer,
+        public Task UnsubscribeAsync(string userId, NamedId<DomainId> appId,
             CancellationToken ct = default)
         {
             return Task.CompletedTask;
diff --git a/backend/src/Squidex/Areas/Api/Controllers/Plans/AppPlansController.cs b/backend/src/Squidex/Areas/Api/Controllers/Plans/AppPlansController.cs
index 4c53faab4..663c0380f 100644
--- a/backend/src/Squidex/Areas/Api/Controllers/Plans/AppPlansController.cs
+++ b/backend/src/Squidex/Areas/Api/Controllers/Plans/AppPlansController.cs
@@ -77,7 +77,7 @@ namespace Squidex.Areas.Api.Controllers.Plans
         [ApiCosts(0)]
         public async Task<IActionResult> PutPlan(string app, [FromBody] ChangePlanDto request)
         {
-            var context = await CommandBus.PublishAsync(request.ToCommand(HttpContext), HttpContext.RequestAborted);
+            var context = await CommandBus.PublishAsync(request.ToCommand(), HttpContext.RequestAborted);
 
             string? redirectUri = null;
 
diff --git a/backend/src/Squidex/Areas/Api/Controllers/Plans/Models/ChangePlanDto.cs b/backend/src/Squidex/Areas/Api/Controllers/Plans/Models/ChangePlanDto.cs
index 66230b9a0..d0138b65e 100644
--- a/backend/src/Squidex/Areas/Api/Controllers/Plans/Models/ChangePlanDto.cs
+++ b/backend/src/Squidex/Areas/Api/Controllers/Plans/Models/ChangePlanDto.cs
@@ -19,12 +19,10 @@ namespace Squidex.Areas.Api.Controllers.Plans.Models
         [LocalizedRequired]
         public string PlanId { get; set; }
 
-        public ChangePlan ToCommand(HttpContext httpContext)
+        public ChangePlan ToCommand()
         {
             var result = SimpleMapper.Map(this, new ChangePlan());
 
-            result.Referer = httpContext.Request.Headers["Referer"];
-
             return result;
         }
     }
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/DomainObject/AppDomainObjectTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/DomainObject/AppDomainObjectTests.cs
index 37bcbbcb0..dccd42af9 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/DomainObject/AppDomainObjectTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/DomainObject/AppDomainObjectTests.cs
@@ -59,7 +59,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
             A.CallTo(() => appPlansProvider.GetPlan(planIdPaid))
                 .Returns(new ConfigAppLimitsPlan { Id = planIdPaid, MaxContributors = 30 });
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, A<string>._, A<string>._, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, A<string>._, default))
                 .Returns(Task.FromResult<Uri?>(null));
 
             // Create a non-empty setting, otherwise the event is not raised as it does not change the domain object.
@@ -220,7 +220,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
         {
             var command = new ChangePlan { PlanId = planIdPaid };
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, default))
                 .Returns(Task.FromResult<Uri?>(null));
 
             await ExecuteCreateAsync();
@@ -236,10 +236,10 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                     CreateEvent(new AppPlanChanged { PlanId = planIdPaid })
                 );
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, default))
                 .MustHaveHappened();
 
-            A.CallTo(() => appPlansBillingManager.SubscribeAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.SubscribeAsync(Actor.Identifier, AppNamedId, planIdPaid, default))
                 .MustHaveHappened();
         }
 
@@ -261,10 +261,10 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                     CreateEvent(new AppPlanChanged { PlanId = planIdPaid })
                 );
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<string?>._, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<CancellationToken>._))
                 .MustNotHaveHappened();
 
-            A.CallTo(() => appPlansBillingManager.SubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<string?>._, A<CancellationToken>._))
+            A.CallTo(() => appPlansBillingManager.SubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<CancellationToken>._))
                 .MustNotHaveHappened();
         }
 
@@ -287,10 +287,10 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                     CreateEvent(new AppPlanReset())
                 );
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<string?>._, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<CancellationToken>._))
                 .MustHaveHappenedOnceExactly();
 
-            A.CallTo(() => appPlansBillingManager.UnsubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<CancellationToken>._))
+            A.CallTo(() => appPlansBillingManager.UnsubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<CancellationToken>._))
                 .MustNotHaveHappened();
         }
 
@@ -313,10 +313,10 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                     CreateEvent(new AppPlanReset())
                 );
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, default))
                 .MustHaveHappenedOnceExactly();
 
-            A.CallTo(() => appPlansBillingManager.UnsubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<string?>._, A<CancellationToken>._))
+            A.CallTo(() => appPlansBillingManager.UnsubscribeAsync(A<string>._, A<NamedId<DomainId>>._, A<CancellationToken>._))
                 .MustHaveHappened();
         }
 
@@ -325,7 +325,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
         {
             var command = new ChangePlan { PlanId = planIdPaid };
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, default))
                 .Returns(new Uri("http://squidex.io"));
 
             await ExecuteCreateAsync();
@@ -350,10 +350,10 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
 
             Assert.Equal(planIdPaid, sut.Snapshot.Plan?.PlanId);
 
-            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, command.Referer, default))
+            A.CallTo(() => appPlansBillingManager.MustRedirectToPortalAsync(Actor.Identifier, AppNamedId, planIdPaid, A<CancellationToken>._))
                 .MustNotHaveHappened();
 
-            A.CallTo(() => appPlansBillingManager.SubscribeAsync(Actor.Identifier, AppNamedId, planIdPaid, A<string?>._, default))
+            A.CallTo(() => appPlansBillingManager.SubscribeAsync(Actor.Identifier, AppNamedId, planIdPaid, A<CancellationToken>._))
                 .MustNotHaveHappened();
         }
 
@@ -668,7 +668,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.DomainObject
                     CreateEvent(new AppDeleted())
                 );
 
-            A.CallTo(() => appPlansBillingManager.SubscribeAsync(command.Actor.Identifier, AppNamedId, null, A<string?>._, default))
+            A.CallTo(() => appPlansBillingManager.UnsubscribeAsync(command.Actor.Identifier, AppNamedId, default))
                 .MustHaveHappened();
         }
 
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Plans/NoopAppPlanBillingManagerTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Plans/NoopAppPlanBillingManagerTests.cs
index a8f9cacf9..6601b4218 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Plans/NoopAppPlanBillingManagerTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Plans/NoopAppPlanBillingManagerTests.cs
@@ -22,13 +22,13 @@ namespace Squidex.Domain.Apps.Entities.Apps.Plans
         [Fact]
         public async Task Should_do_nothing_if_subscribing()
         {
-            await sut.SubscribeAsync(null!, null!, null, null);
+            await sut.SubscribeAsync(null!, null!, null!);
         }
 
         [Fact]
         public async Task Should_do_nothing_if_unsubscribing()
         {
-            await sut.SubscribeAsync(null!, null!, null, null);
+            await sut.UnsubscribeAsync(null!, null!);
         }
 
         [Fact]
@@ -42,7 +42,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Plans
         [Fact]
         public async Task Should_do_nothing_if_checking_for_redirect()
         {
-            var result = await sut.MustRedirectToPortalAsync(null!, null!, null, null);
+            var result = await sut.MustRedirectToPortalAsync(null!, null!, null);
 
             Assert.Null(result);
         }