diff --git a/apps/api/v1/pages/api/bookings/[id]/_delete.ts b/apps/api/v1/pages/api/bookings/[id]/_delete.ts
index 476b1de577..1756c29467 100644
--- a/apps/api/v1/pages/api/bookings/[id]/_delete.ts
+++ b/apps/api/v1/pages/api/bookings/[id]/_delete.ts
@@ -82,6 +82,7 @@ async function handler(req: NextApiRequest) {
   return await handleCancelBooking({
     bookingData: { id, allRemainingBookings, cancellationReason, cancelledBy },
     userId: req.userId,
+    actionSource: "API_V1",
   });
 }
 
diff --git a/apps/api/v2/src/ee/bookings/2024-04-15/controllers/bookings.controller.ts b/apps/api/v2/src/ee/bookings/2024-04-15/controllers/bookings.controller.ts
index 738092fa0f..47a8bd5390 100644
--- a/apps/api/v2/src/ee/bookings/2024-04-15/controllers/bookings.controller.ts
+++ b/apps/api/v2/src/ee/bookings/2024-04-15/controllers/bookings.controller.ts
@@ -279,6 +279,7 @@ export class BookingsController_2024_04_15 {
           platformCancelUrl: bookingRequest.platformCancelUrl,
           platformRescheduleUrl: bookingRequest.platformRescheduleUrl,
           platformBookingUrl: bookingRequest.platformBookingUrl,
+          actionSource: "API_V2",
         });
         if (!res.onlyRemovedAttendee && res.isPlatformManagedUserBooking) {
           void (await this.billingService.cancelUsageByBookingUid(res.bookingUid));
diff --git a/packages/features/bookings/lib/handleCancelBooking.ts b/packages/features/bookings/lib/handleCancelBooking.ts
index f64ed8d7e8..827ee3e434 100644
--- a/packages/features/bookings/lib/handleCancelBooking.ts
+++ b/packages/features/bookings/lib/handleCancelBooking.ts
@@ -10,7 +10,7 @@ import {
   makeGuestActor,
   makeUserActor,
 } from "@calcom/features/booking-audit/lib/makeActor";
-import type { ActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 import { BookingReferenceRepository } from "@calcom/features/bookingReference/repositories/BookingReferenceRepository";
 import { getBookingEventHandlerService } from "@calcom/features/bookings/di/BookingEventHandlerService.container";
 import EventManager from "@calcom/features/bookings/lib/EventManager";
@@ -81,7 +81,7 @@ export type CancelBookingInput = {
   userId?: number;
   userUuid?: string;
   bookingData: z.infer<typeof bookingCancelInput>;
-  actionSource?: ActionSource;
+  actionSource: ValidActionSource;
 } & PlatformParams;
 
 type Dependencies = {
@@ -173,17 +173,7 @@ async function handler(input: CancelBookingInput, dependencies?: Dependencies) {
 
   const userUuid = input.userUuid ?? null;
 
-  // Extract action source once for reuse
-  const actionSource = input.actionSource ?? "UNKNOWN";
-  if (actionSource === "UNKNOWN") {
-    log.warn(
-      "Booking cancellation with unknown actionSource",
-      safeStringify({
-        bookingUid: bookingToDelete.uid,
-        userUuid,
-      })
-    );
-  }
+  const actionSource = input.actionSource;
 
   const actorToUse = getAuditActor({
     userUuid,
@@ -724,10 +714,15 @@ type BookingCancelServiceDependencies = {
 export class BookingCancelService implements IBookingCancelService {
   constructor(private readonly deps: BookingCancelServiceDependencies) {}
 
-  async cancelBooking(input: { bookingData: CancelRegularBookingData; bookingMeta?: CancelBookingMeta }) {
+  async cancelBooking(input: {
+    bookingData: CancelRegularBookingData;
+    bookingMeta?: CancelBookingMeta;
+    actionSource: ValidActionSource;
+  }) {
     const cancelBookingInput: CancelBookingInput = {
       bookingData: input.bookingData,
       ...(input.bookingMeta || {}),
+      actionSource: input.actionSource,
     };
 
     return handler(cancelBookingInput, this.deps);
diff --git a/packages/features/bookings/lib/handleCancelBooking/test/handleCancelBooking.test.ts b/packages/features/bookings/lib/handleCancelBooking/test/handleCancelBooking.test.ts
index 9bbe478412..0da58f3485 100644
--- a/packages/features/bookings/lib/handleCancelBooking/test/handleCancelBooking.test.ts
+++ b/packages/features/bookings/lib/handleCancelBooking/test/handleCancelBooking.test.ts
@@ -134,6 +134,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "No reason",
       },
+      actionSource: "WEBAPP",
     });
 
     expectBookingCancelledWebhookToHaveBeenFired({
@@ -264,6 +265,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "No reason",
       },
+      actionSource: "WEBAPP",
     });
 
     expectBookingCancelledWebhookToHaveBeenFired({
@@ -411,6 +413,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "Testing round robin cancellation with host as attendee",
       },
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -563,6 +566,7 @@ describe("Cancel Booking", () => {
         cancelledBy: primaryHost.email,
         cancellationReason: "Testing EMAIL_HOST workflow sends to secondary host in round robin",
       },
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -640,6 +644,7 @@ describe("Cancel Booking", () => {
           cancelledBy: organizer.email,
           cancellationReason: "Testing past booking cancellation",
         },
+        actionSource: "WEBAPP",
       })
     ).rejects.toThrow("Cannot cancel a booking that has already ended");
   });
@@ -708,6 +713,7 @@ describe("Cancel Booking", () => {
           uid: uidOfBookingToBeCancelled,
           cancelledBy: organizer.email,
         },
+        actionSource: "WEBAPP",
       })
     ).rejects.toThrow("Cancellation reason is required when you are the host");
   });
@@ -819,6 +825,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "No reason",
       },
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -945,6 +952,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "No reason",
       },
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -1062,6 +1070,7 @@ describe("Cancel Booking", () => {
         cancellationReason: "Attendee cancelled within time threshold",
       },
       userId: 999,
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -1170,6 +1179,7 @@ describe("Cancel Booking", () => {
         cancelledBy: organizer.email,
         cancellationReason: "Organization booking cancellation test",
       },
+      actionSource: "WEBAPP",
     });
 
     expectBookingCancelledWebhookToHaveBeenFired({
@@ -1292,6 +1302,7 @@ describe("Cancel Booking", () => {
         cancellationReason: "Cancelling seated event",
       },
       userId: organizer.id,
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -1413,6 +1424,7 @@ describe("Cancel Booking", () => {
         allRemainingBookings: true,
       },
       userId: organizer.id,
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -1534,6 +1546,7 @@ describe("Cancel Booking", () => {
         cancelSubsequentBookings: true,
       },
       userId: organizer.id,
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
@@ -1647,6 +1660,7 @@ describe("Cancel Booking", () => {
         cancellationReason: "Testing booking reference cleanup",
       },
       userId: organizer.id,
+      actionSource: "WEBAPP",
     });
 
     expect(result.success).toBe(true);
diff --git a/packages/features/bookings/lib/handleConfirmation.ts b/packages/features/bookings/lib/handleConfirmation.ts
index 22e6bbf993..9269ae1f1b 100644
--- a/packages/features/bookings/lib/handleConfirmation.ts
+++ b/packages/features/bookings/lib/handleConfirmation.ts
@@ -2,7 +2,7 @@ import { eventTypeAppMetadataOptionalSchema } from "@calcom/app-store/zod-utils"
 import { scheduleMandatoryReminder } from "@calcom/ee/workflows/lib/reminders/scheduleMandatoryReminder";
 import { sendScheduledEmailsAndSMS } from "@calcom/emails/email-manager";
 import type { Actor } from "@calcom/features/booking-audit/lib/dto/types";
-import type { ActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 import { getBookingEventHandlerService } from "@calcom/features/bookings/di/BookingEventHandlerService.container";
 import type { EventManagerUser } from "@calcom/features/bookings/lib/EventManager";
 import EventManager, { placeholderCreatedEvent } from "@calcom/features/bookings/lib/EventManager";
@@ -48,7 +48,7 @@ async function fireBookingAcceptedEvent({
 }: {
   actor: Actor;
   organizationId: number | null;
-  actionSource: ActionSource;
+  actionSource: ValidActionSource;
   acceptedBookings: {
     uid: string;
     oldStatus: BookingStatus;
@@ -133,7 +133,7 @@ export async function handleConfirmation(args: {
   emailsEnabled?: boolean;
   platformClientParams?: PlatformClientParams;
   traceContext: TraceContext;
-  actionSource: ActionSource;
+  actionSource: ValidActionSource;
   actor: Actor;
 }) {
   const {
diff --git a/packages/features/bookings/lib/handleSeats/test/handleSeats.test.ts b/packages/features/bookings/lib/handleSeats/test/handleSeats.test.ts
index 49d24127ea..961cbfce43 100644
--- a/packages/features/bookings/lib/handleSeats/test/handleSeats.test.ts
+++ b/packages/features/bookings/lib/handleSeats/test/handleSeats.test.ts
@@ -1976,6 +1976,7 @@ describe("handleSeats", () => {
             cancellationReason: "test cancellation reason",
           },
           userId: organizer.id,
+          actionSource: "WEBAPP",
         });
 
         // Ensure that the booking has been cancelled
@@ -2115,6 +2116,7 @@ describe("handleSeats", () => {
             cancellationReason: "test cancellation reason",
           },
           userId: organizer.id,
+          actionSource: "WEBAPP",
         });
 
         // Ensure that the booking has been cancelled
@@ -2967,6 +2969,7 @@ describe("handleSeats", () => {
             cancellationReason: "test cancellation reason",
           },
           userId: organizer.id,
+          actionSource: "WEBAPP",
         });
 
         // Ensure that the booking has been cancelled
diff --git a/packages/features/bookings/lib/interfaces/IBookingCancelService.ts b/packages/features/bookings/lib/interfaces/IBookingCancelService.ts
index adc99efd9d..1fd65c5ec2 100644
--- a/packages/features/bookings/lib/interfaces/IBookingCancelService.ts
+++ b/packages/features/bookings/lib/interfaces/IBookingCancelService.ts
@@ -3,10 +3,12 @@ import type {
   CancelBookingMeta,
   HandleCancelBookingResponse,
 } from "../dto/BookingCancel";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 
 export interface IBookingCancelService {
   cancelBooking(input: {
     bookingData: CancelRegularBookingData;
     bookingMeta?: CancelBookingMeta;
+    actionSource: ValidActionSource;
   }): Promise<HandleCancelBookingResponse>;
 }
diff --git a/packages/trpc/server/routers/viewer/bookings/_router.tsx b/packages/trpc/server/routers/viewer/bookings/_router.tsx
index 105713ebac..960d181543 100644
--- a/packages/trpc/server/routers/viewer/bookings/_router.tsx
+++ b/packages/trpc/server/routers/viewer/bookings/_router.tsx
@@ -121,6 +121,7 @@ export const bookingsRouter = router({
     return reportBookingHandler({
       ctx,
       input,
+      actionSource: "WEBAPP",
     });
   }),
   reportWrongAssignment: authedProcedure
diff --git a/packages/trpc/server/routers/viewer/bookings/addGuests.handler.ts b/packages/trpc/server/routers/viewer/bookings/addGuests.handler.ts
index cda0198ce9..90d6c82889 100644
--- a/packages/trpc/server/routers/viewer/bookings/addGuests.handler.ts
+++ b/packages/trpc/server/routers/viewer/bookings/addGuests.handler.ts
@@ -2,7 +2,7 @@ import { getUsersCredentialsIncludeServiceAccountKey } from "@calcom/app-store/d
 import { eventTypeMetaDataSchemaWithTypedApps } from "@calcom/app-store/zod-utils";
 import dayjs from "@calcom/dayjs";
 import { makeUserActor } from "@calcom/features/booking-audit/lib/makeActor";
-import type { ActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 import { getBookingEventHandlerService } from "@calcom/features/bookings/di/BookingEventHandlerService.container";
 import { BookingEmailSmsHandler } from "@calcom/features/bookings/lib/BookingEmailSmsHandler";
 import EventManager from "@calcom/features/bookings/lib/EventManager";
@@ -35,7 +35,7 @@ type AddGuestsOptions = {
   };
   input: TAddGuestsInputSchema;
   emailsEnabled?: boolean;
-  actionSource: ActionSource;
+  actionSource: ValidActionSource;
 };
 
 export type Booking = NonNullable<
diff --git a/packages/trpc/server/routers/viewer/bookings/reportBooking.handler.ts b/packages/trpc/server/routers/viewer/bookings/reportBooking.handler.ts
index 9d856c6db4..401b9be929 100644
--- a/packages/trpc/server/routers/viewer/bookings/reportBooking.handler.ts
+++ b/packages/trpc/server/routers/viewer/bookings/reportBooking.handler.ts
@@ -1,4 +1,5 @@
 import { PrismaBookingReportRepository } from "@calcom/features/bookingReport/repositories/PrismaBookingReportRepository";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 import handleCancelBooking from "@calcom/features/bookings/lib/handleCancelBooking";
 import { BookingRepository } from "@calcom/features/bookings/repositories/BookingRepository";
 import { BookingAccessService } from "@calcom/features/bookings/services/BookingAccessService";
@@ -16,11 +17,12 @@ type ReportBookingOptions = {
     user: NonNullable<TrpcSessionUser>;
   };
   input: TReportBookingInputSchema;
+  actionSource: ValidActionSource;
 };
 
 const log = logger.getSubLogger({ prefix: ["reportBookingHandler"] });
 
-export const reportBookingHandler = async ({ ctx, input }: ReportBookingOptions) => {
+export const reportBookingHandler = async ({ ctx, input, actionSource }: ReportBookingOptions) => {
   const { user } = ctx;
   const { bookingUid, reason, description } = input;
 
@@ -90,6 +92,7 @@ export const reportBookingHandler = async ({ ctx, input }: ReportBookingOptions)
           ...(seatReferenceUid ? { seatReferenceUid } : {}),
         },
         userId: user.id,
+        actionSource,
       });
       didCancel = true;
     } catch (error) {
diff --git a/packages/trpc/server/routers/viewer/bookings/requestReschedule.handler.ts b/packages/trpc/server/routers/viewer/bookings/requestReschedule.handler.ts
index 6d46e8dc87..ef77ee55e6 100644
--- a/packages/trpc/server/routers/viewer/bookings/requestReschedule.handler.ts
+++ b/packages/trpc/server/routers/viewer/bookings/requestReschedule.handler.ts
@@ -6,7 +6,7 @@ import { getUsersCredentialsIncludeServiceAccountKey } from "@calcom/app-store/d
 import dayjs from "@calcom/dayjs";
 import { sendRequestRescheduleEmailAndSMS } from "@calcom/emails/email-manager";
 import { makeUserActor } from "@calcom/features/booking-audit/lib/makeActor";
-import type { ActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
+import type { ValidActionSource } from "@calcom/features/booking-audit/lib/types/actionSource";
 import { getBookingEventHandlerService } from "@calcom/features/bookings/di/BookingEventHandlerService.container";
 import { getFeaturesRepository } from "@calcom/features/di/containers/FeaturesRepository";
 import { getCalEventResponses } from "@calcom/features/bookings/lib/getCalEventResponses";
@@ -47,7 +47,7 @@ type RequestRescheduleOptions = {
     user: NonNullable<TrpcSessionUser>;
   };
   input: TRequestRescheduleInputSchema;
-  source: ActionSource;
+  source: ValidActionSource;
 };
 const log = logger.getSubLogger({ prefix: ["requestRescheduleHandler"] });
 export const requestRescheduleHandler = async ({ ctx, input, source }: RequestRescheduleOptions) => {