diff --git a/apps/web/pages/api/book/event.ts b/apps/web/pages/api/book/event.ts
index a56ca2e051..ba2f2828a0 100644
--- a/apps/web/pages/api/book/event.ts
+++ b/apps/web/pages/api/book/event.ts
@@ -237,7 +237,8 @@ async function handler(req: NextApiRequest) {
     throw new HttpError({ statusCode: 400, message: error.message });
   }
 
-  const eventType = !eventTypeId ? getDefaultEvent(eventTypeSlug) : await getEventTypesFromDB(eventTypeId);
+  const eventType =
+    !eventTypeId && !!eventTypeSlug ? getDefaultEvent(eventTypeSlug) : await getEventTypesFromDB(eventTypeId);
   if (!eventType) throw new HttpError({ statusCode: 404, message: "eventType.notFound" });
 
   let users = !eventTypeId
diff --git a/packages/app-store/slackmessaging/api/add.ts b/packages/app-store/slackmessaging/api/add.ts
index ec3c190ff5..7cac58db40 100644
--- a/packages/app-store/slackmessaging/api/add.ts
+++ b/packages/app-store/slackmessaging/api/add.ts
@@ -1,45 +1,41 @@
-import type { NextApiRequest, NextApiResponse } from "next";
+import type { NextApiRequest } from "next";
 import { stringify } from "querystring";
 
+import { HttpError } from "@calcom/lib/http-error";
+import { defaultHandler, defaultResponder } from "@calcom/lib/server";
 import prisma from "@calcom/prisma";
 
-import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
+import { getSlackAppKeys } from "../lib/utils";
 
-let client_id = "";
 const scopes = ["commands", "users:read", "users:read.email", "chat:write", "chat:write.public"];
 
-export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+async function handler(req: NextApiRequest) {
   if (!req.session?.user?.id) {
-    return res.status(401).json({ message: "You must be logged in to do this" });
+    throw new HttpError({ statusCode: 401, message: "You must be logged in to do this" });
   }
 
-  if (req.method === "GET") {
-    if (!req.session?.user?.id) {
-      return res.status(401).json({ message: "You must be logged in to do this" });
-    }
-
-    const appKeys = await getAppKeysFromSlug("slack");
-    if (typeof appKeys.client_id === "string") client_id = appKeys.client_id;
-    if (!client_id) return res.status(400).json({ message: "Slack client_id missing" });
-    // Get user
-    await prisma.user.findFirst({
-      rejectOnNotFound: true,
-      where: {
-        id: req.session.user.id,
-      },
-      select: {
-        id: true,
-      },
-    });
-    const params = {
-      client_id,
-      scope: scopes.join(","),
-    };
-    const query = stringify(params);
-    const url = `https://slack.com/oauth/v2/authorize?${query}&user_`;
-    // const url =
-    //   "https://slack.com/oauth/v2/authorize?client_id=3194129032064.3178385871204&scope=chat:write,commands&user_scope=";
-    return res.status(200).json({ url });
-  }
-  return res.status(404).json({ error: "Not Found" });
+  const { client_id } = await getSlackAppKeys();
+  // Get user
+  await prisma.user.findFirst({
+    rejectOnNotFound: true,
+    where: {
+      id: req.session.user.id,
+    },
+    select: {
+      id: true,
+    },
+  });
+  const params = {
+    client_id,
+    scope: scopes.join(","),
+  };
+  const query = stringify(params);
+  const url = `https://slack.com/oauth/v2/authorize?${query}&user_`;
+  // const url =
+  //   "https://slack.com/oauth/v2/authorize?client_id=3194129032064.3178385871204&scope=chat:write,commands&user_scope=";
+  return { url };
 }
+
+export default defaultHandler({
+  GET: Promise.resolve({ default: defaultResponder(handler) }),
+});
diff --git a/packages/app-store/slackmessaging/api/callback.ts b/packages/app-store/slackmessaging/api/callback.ts
index ee2f37189f..5e4300168a 100644
--- a/packages/app-store/slackmessaging/api/callback.ts
+++ b/packages/app-store/slackmessaging/api/callback.ts
@@ -1,57 +1,60 @@
 import type { NextApiRequest, NextApiResponse } from "next";
 import { stringify } from "querystring";
+import { z } from "zod";
 
+import { HttpError } from "@calcom/lib/http-error";
+import { defaultHandler, defaultResponder } from "@calcom/lib/server";
 import prisma from "@calcom/prisma";
 
-import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
+import { getSlackAppKeys } from "../lib/utils";
 
-let client_id = "";
-let client_secret = "";
+const callbackQuerySchema = z.object({
+  code: z.string().min(1),
+});
 
-export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+async function handler(req: NextApiRequest, res: NextApiResponse) {
   if (!req.session?.user?.id) {
-    return res.status(401).json({ message: "You must be logged in to do this" });
+    throw new HttpError({ statusCode: 401, message: "You must be logged in to do this" });
   }
 
-  if (req.method === "GET") {
-    // Get user
-    const { code } = req.query;
+  // Get user
+  const parsedCallbackQuery = callbackQuerySchema.safeParse(req.query);
 
-    if (!code) {
-      res.redirect("/apps/installed"); // Redirect to where the user was if they cancel the signup or if the oauth fails
-    }
+  if (!parsedCallbackQuery.success) {
+    return res.redirect("/apps/installed"); // Redirect to where the user was if they cancel the signup or if the oauth fails
+  }
 
-    const appKeys = await getAppKeysFromSlug("slack");
-    if (typeof appKeys.client_id === "string") client_id = appKeys.client_id;
-    if (typeof appKeys.client_secret === "string") client_secret = appKeys.client_secret;
-    if (!client_id) return res.status(400).json({ message: "Slack client_id missing" });
-    if (!client_secret) return res.status(400).json({ message: "Slack client_secret missing" });
+  const { code } = parsedCallbackQuery.data;
+  const { client_id, client_secret } = await getSlackAppKeys();
 
-    const query = {
-      client_secret,
-      client_id,
-      code,
-    };
-    const params = stringify(query);
-    console.log("params", params);
+  const query = {
+    client_secret,
+    client_id,
+    code,
+  };
+  const params = stringify(query);
+  const url = `https://slack.com/api/oauth.v2.access?${params}`;
+  const result = await fetch(url);
+  const responseBody = await result.json();
 
-    const url = `https://slack.com/api/oauth.v2.access?${params}`;
-    const result = await fetch(url);
-    const responseBody = await result.json();
-
-    await prisma.user.update({
-      where: {
-        id: req.session.user.id,
-      },
-      data: {
-        credentials: {
-          create: {
-            type: "slack_app",
-            key: responseBody,
-          },
+  await prisma.user.update({
+    where: {
+      id: req.session.user.id,
+    },
+    data: {
+      credentials: {
+        create: {
+          type: "slack_app",
+          key: responseBody,
+          appId: "slack",
         },
       },
-    });
-    return res.redirect("/apps/installed");
-  }
+    },
+  });
+
+  return res.redirect("/apps/installed");
 }
+
+export default defaultHandler({
+  GET: Promise.resolve({ default: defaultResponder(handler) }),
+});
diff --git a/packages/app-store/slackmessaging/api/commandHandler.ts b/packages/app-store/slackmessaging/api/commandHandler.ts
index 6b78eecd17..f3436b08ae 100644
--- a/packages/app-store/slackmessaging/api/commandHandler.ts
+++ b/packages/app-store/slackmessaging/api/commandHandler.ts
@@ -1,8 +1,10 @@
 import type { NextApiRequest, NextApiResponse } from "next";
+import { z } from "zod";
+
+import { defaultHandler, defaultResponder } from "@calcom/lib/server";
 
 import { showCreateEventMessage, showTodayMessage } from "../lib";
 import showLinksMessage from "../lib/showLinksMessage";
-import slackVerify from "../lib/slackVerify";
 
 export enum SlackAppCommands {
   CREATE_EVENT = "create-event",
@@ -10,20 +12,28 @@ export enum SlackAppCommands {
   LINKS = "links",
 }
 
-export default async function handler(req: NextApiRequest, res: NextApiResponse) {
-  if (req.method === "POST") {
-    const command = req.body.command.split("/").pop();
-    await slackVerify(req, res);
-    switch (command) {
-      case SlackAppCommands.CREATE_EVENT:
-        return await showCreateEventMessage(req, res);
-      case SlackAppCommands.TODAY:
-        return await showTodayMessage(req, res);
-      case SlackAppCommands.LINKS:
-        return await showLinksMessage(req, res);
-      default:
-        return res.status(404).json({ message: `Command not found` });
-    }
+const commandHandlerBodySchema = z.object({
+  command: z.string().min(1),
+  user_id: z.string(),
+  trigger_id: z.string(),
+  channel_id: z.string().optional(),
+});
+
+async function handler(req: NextApiRequest, res: NextApiResponse) {
+  const body = commandHandlerBodySchema.parse(req.body);
+  const command = body.command.split("/").pop();
+  switch (command) {
+    case SlackAppCommands.CREATE_EVENT:
+      return await showCreateEventMessage(req, res);
+    case SlackAppCommands.TODAY:
+      return await showTodayMessage(req, res);
+    case SlackAppCommands.LINKS:
+      return await showLinksMessage(req, res);
+    default:
+      return res.status(404).json({ message: `Command not found` });
   }
-  return res.status(400).json({ message: "Invalid request" });
 }
+
+export default defaultHandler({
+  POST: Promise.resolve({ default: defaultResponder(handler) }),
+});
diff --git a/packages/app-store/slackmessaging/api/interactiveHandler.ts b/packages/app-store/slackmessaging/api/interactiveHandler.ts
index 25c07b16c8..70968b469d 100644
--- a/packages/app-store/slackmessaging/api/interactiveHandler.ts
+++ b/packages/app-store/slackmessaging/api/interactiveHandler.ts
@@ -1,7 +1,6 @@
 import { NextApiRequest, NextApiResponse } from "next";
 
 import createEvent from "../lib/actions/createEvent";
-import slackVerify from "../lib/slackVerify";
 
 enum InteractionEvents {
   CREATE_EVENT = "cal.event.create",
@@ -9,14 +8,11 @@ enum InteractionEvents {
 
 export default async function interactiveHandler(req: NextApiRequest, res: NextApiResponse) {
   if (req.method === "POST") {
-    await slackVerify(req, res);
     const payload = JSON.parse(req.body.payload);
     const actions = payload.view.callback_id;
-
-    // I've not found a case where actions is ever > than 1 when this function is called.
     switch (actions) {
       case InteractionEvents.CREATE_EVENT:
-        return await createEvent(req, res);
+        await createEvent(req, res);
       default:
         return res.status(200).end(); // Techincally an invalid request but we don't want to return an throw an error to slack - 200 just does nothing
     }
diff --git a/packages/app-store/slackmessaging/lib/actions/createEvent.ts b/packages/app-store/slackmessaging/lib/actions/createEvent.ts
index 3530e73686..47456d0da2 100644
--- a/packages/app-store/slackmessaging/lib/actions/createEvent.ts
+++ b/packages/app-store/slackmessaging/lib/actions/createEvent.ts
@@ -1,46 +1,24 @@
 import { WebClient } from "@slack/web-api";
 import dayjs from "dayjs";
 import { NextApiRequest, NextApiResponse } from "next";
+import { z } from "zod";
 
 import { WEBAPP_URL } from "@calcom/lib/constants";
 import db from "@calcom/prisma";
+import type { BookingCreateBody } from "@calcom/prisma/zod-utils";
 
 import { WhereCredsEqualsId } from "../WhereCredsEqualsID";
 import { getUserEmail } from "../utils";
-import BookingSuccess from "../views/BookingSuccess";
-
-// TODO: Move this type to a shared location - being used in more than one package.
-export type BookingCreateBody = {
-  email: string;
-  end: string;
-  web3Details?: {
-    userWallet: string;
-    userSignature: unknown;
-  };
-  eventTypeId: number;
-  guests?: string[];
-  location: string;
-  name: string;
-  notes?: string;
-  rescheduleUid?: string;
-  start: string;
-  timeZone: string;
-  user?: string | string[];
-  language: string;
-  customInputs: { label: string; value: string }[];
-  metadata: {
-    [key: string]: string;
-  };
-};
 
 export default async function createEvent(req: NextApiRequest, res: NextApiResponse) {
   const {
     user,
     view: {
       state: { values },
+      id: view_id,
     },
+    response_url,
   } = JSON.parse(req.body.payload);
-
   // This is a mess I have no idea why slack makes getting infomation this hard.
   const {
     eventName: {
@@ -90,9 +68,11 @@ export default async function createEvent(req: NextApiRequest, res: NextApiRespo
       },
     });
 
-  const slackCredentials = foundUser?.credentials[0].key; // Only one slack credential for user
+  const SlackCredentialsSchema = z.object({
+    access_token: z.string(),
+  });
 
-  // @ts-ignore access_token must exist on slackCredentials otherwise we have wouldnt have reached this endpoint
+  const slackCredentials = SlackCredentialsSchema.parse(foundUser?.credentials[0].key); // Only one slack credential for user
 
   const access_token = slackCredentials?.access_token;
   // https://api.slack.com/authentication/best-practices#verifying since we verify the request is coming from slack we can store the access_token in the DB.
@@ -100,9 +80,7 @@ export default async function createEvent(req: NextApiRequest, res: NextApiRespo
   // This could get a bit weird as there is a 3 second limit until the post times ou
 
   // Compute all users that have been selected and get their email.
-  const invitedGuestsEmails = selected_users.map(
-    async (userId: string) => await getUserEmail(client, userId)
-  );
+  const invitedGuestsEmails = selected_users.map((userId: string) => getUserEmail(client, userId));
 
   const startDate = dayjs(`${selected_date} ${selected_time}`, "YYYY-MM-DD HH:mm");
 
@@ -124,36 +102,18 @@ export default async function createEvent(req: NextApiRequest, res: NextApiRespo
     notes: "This event was created with slack.",
   };
 
-  if (startDate < dayjs()) {
-    client.chat.postMessage({
-      token: access_token,
-      channel: user.id,
-      text: `Error: Day must not be in the past`,
-    });
-    return res.status(200).send("");
-  }
-
-  fetch(`${WEBAPP_URL}/api/book/event`, {
+  const response = await fetch(`${WEBAPP_URL}/api/book/event`, {
     method: "POST",
     body: JSON.stringify(PostData),
     headers: {
       "Content-Type": "application/json",
     },
-  })
-    .then(() => {
-      client.chat.postMessage({
-        token: access_token,
-        channel: user.id, // We just dm the user here as there is no point posting this message publicly - In future it might be worth pinging all the members of the invite also?
-        text: "Booking has been created.",
-      });
-      return res.status(200).send(""); // Slack requires a 200 to be sent to clear the modal. This makes it massive pain to update the user that the event has been created.
-    })
-    .catch((e) => {
-      client.chat.postMessage({
-        token: access_token,
-        channel: user.id,
-        text: `Error: ${e}`,
-      });
-      return res.status(200).send("");
-    });
+  });
+  const body = await response.json();
+  client.chat.postMessage({
+    token: access_token,
+    channel: user.id,
+    text: body.errorCode ? `Error: ${body.errorCode}` : "Booking has been created.",
+  });
+  return res.status(200).send("");
 }
diff --git a/packages/app-store/slackmessaging/lib/showCreateEventMessage.ts b/packages/app-store/slackmessaging/lib/showCreateEventMessage.ts
index a712af81b5..4d9b8baeed 100644
--- a/packages/app-store/slackmessaging/lib/showCreateEventMessage.ts
+++ b/packages/app-store/slackmessaging/lib/showCreateEventMessage.ts
@@ -5,10 +5,12 @@ import { NextApiRequest, NextApiResponse } from "next";
 import prisma from "@calcom/prisma";
 
 import { WhereCredsEqualsId } from "./WhereCredsEqualsID";
+import slackVerify from "./slackVerify";
 import { CreateEventModal, NoUserMessage } from "./views";
 
 export default async function showCreateEventMessage(req: NextApiRequest, res: NextApiResponse) {
   const body = req.body;
+  await slackVerify(req, res);
 
   const data = await prisma.credential.findFirst({
     ...WhereCredsEqualsId(body.user_id),
@@ -35,5 +37,5 @@ export default async function showCreateEventMessage(req: NextApiRequest, res: N
     trigger_id: body.trigger_id,
     view: CreateEventModal(data),
   });
-  res.status(200).end();
+  return res.status(200).end();
 }
diff --git a/packages/app-store/slackmessaging/lib/showLinksMessage.ts b/packages/app-store/slackmessaging/lib/showLinksMessage.ts
index 6747180dbf..8ef711bed3 100644
--- a/packages/app-store/slackmessaging/lib/showLinksMessage.ts
+++ b/packages/app-store/slackmessaging/lib/showLinksMessage.ts
@@ -1,15 +1,17 @@
 import { Prisma } from "@prisma/client";
-import { KnownBlock, WebClient } from "@slack/web-api";
+import { WebClient } from "@slack/web-api";
 import { NextApiRequest, NextApiResponse } from "next";
 
 import prisma from "@calcom/prisma";
 
 import { WhereCredsEqualsId } from "./WhereCredsEqualsID";
-import { CreateEventModal, NoUserMessage } from "./views";
+import slackVerify from "./slackVerify";
+import { NoUserMessage } from "./views";
 import ShowLinks from "./views/ShowLinks";
 
 export default async function showLinksMessage(req: NextApiRequest, res: NextApiResponse) {
   const body = req.body;
+  await slackVerify(req, res);
 
   const data = await prisma.credential.findFirst({
     ...WhereCredsEqualsId(body.user_id),
@@ -40,9 +42,8 @@ export default async function showLinksMessage(req: NextApiRequest, res: NextApi
   slackClient.chat.postMessage({
     channel: body.channel_id,
     text: `${data.user?.username}'s Cal.com Links`,
-    //@ts-ignore this doesnt need to be of type Block[] - an object works completely fine
     blocks,
   });
 
-  res.status(200).end();
+  return res.status(200).end();
 }
diff --git a/packages/app-store/slackmessaging/lib/showTodayMessage.ts b/packages/app-store/slackmessaging/lib/showTodayMessage.ts
index 9809c1075a..3a62b83325 100644
--- a/packages/app-store/slackmessaging/lib/showTodayMessage.ts
+++ b/packages/app-store/slackmessaging/lib/showTodayMessage.ts
@@ -5,11 +5,12 @@ import { NextApiRequest, NextApiResponse } from "next";
 import prisma from "@calcom/prisma";
 
 import { WhereCredsEqualsId } from "./WhereCredsEqualsID";
+import slackVerify from "./slackVerify";
 import { NoUserMessage, TodayMessage } from "./views";
 
 export default async function showCreateEventMessage(req: NextApiRequest, res: NextApiResponse) {
   const body = req.body;
-
+  await slackVerify(req, res);
   const foundUser = await prisma.credential.findFirst({
     ...WhereCredsEqualsId(body.user_id),
     include: {
@@ -50,5 +51,5 @@ export default async function showCreateEventMessage(req: NextApiRequest, res: N
     },
   });
 
-  res.status(200).json(TodayMessage(bookings));
+  return res.status(200).json(TodayMessage(bookings));
 }
diff --git a/packages/app-store/slackmessaging/lib/slackVerify.ts b/packages/app-store/slackmessaging/lib/slackVerify.ts
index fc43b5020b..52116d6ff9 100644
--- a/packages/app-store/slackmessaging/lib/slackVerify.ts
+++ b/packages/app-store/slackmessaging/lib/slackVerify.ts
@@ -3,17 +3,14 @@ import dayjs from "dayjs";
 import { NextApiRequest, NextApiResponse } from "next";
 import { stringify } from "querystring";
 
-import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
-
-let signingSecret = "";
+import { getSlackAppKeys } from "./utils";
 
 export default async function slackVerify(req: NextApiRequest, res: NextApiResponse) {
-  const body = req.body;
   const timeStamp = req.headers["x-slack-request-timestamp"] as string; // Always returns a string and not a string[]
   const slackSignature = req.headers["x-slack-signature"] as string;
   const currentTime = dayjs().unix();
-  let { signing_secret } = await getAppKeysFromSlug("slack");
-  if (typeof signing_secret === "string") signingSecret = signing_secret;
+  const { signing_secret: signingSecret } = await getSlackAppKeys();
+  const [version, hash] = slackSignature.split("=");
 
   if (!timeStamp) {
     return res.status(400).json({ message: "Missing X-Slack-Request-Timestamp header" });
@@ -27,10 +24,13 @@ export default async function slackVerify(req: NextApiRequest, res: NextApiRespo
     return res.status(400).json({ message: "Request is too old" });
   }
 
-  const signature_base = `v0:${timeStamp}:${stringify(body)}`;
-  const signed_sig = "v0=" + createHmac("sha256", signingSecret).update(signature_base).digest("hex");
+  const hmac = createHmac("sha256", signingSecret);
 
-  if (signed_sig !== slackSignature) {
-    return res.status(400).json({ message: "Invalid signature" });
+  hmac.update(`${version}:${timeStamp}:${stringify(req.body)}`);
+
+  const signed_sig = hmac.digest("hex");
+  console.log({ signed_sig, hash, match: signed_sig === hash });
+  if (signed_sig !== hash) {
+    throw new Error("Hashes do not match ");
   }
 }
diff --git a/packages/app-store/slackmessaging/lib/utils.ts b/packages/app-store/slackmessaging/lib/utils.ts
index 0a518377ef..6345e7cf51 100644
--- a/packages/app-store/slackmessaging/lib/utils.ts
+++ b/packages/app-store/slackmessaging/lib/utils.ts
@@ -1,8 +1,18 @@
 import { WebClient } from "@slack/web-api";
+import { z } from "zod";
 
-const getUserEmail = async (client: WebClient, userId: string) =>
-  await (
-    await client.users.info({ user: userId })
-  ).user?.profile?.email;
+import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
 
-export { getUserEmail };
+export const getUserEmail = async (client: WebClient, userId: string) =>
+  (await client.users.info({ user: userId })).user?.profile?.email;
+
+const slackAppKeysSchema = z.object({
+  client_id: z.string(),
+  client_secret: z.string(),
+  signing_secret: z.string(),
+});
+
+export const getSlackAppKeys = async () => {
+  const appKeys = await getAppKeysFromSlug("slack");
+  return slackAppKeysSchema.parse(appKeys);
+};
diff --git a/packages/app-store/slackmessaging/lib/views/CreateEventModal.ts b/packages/app-store/slackmessaging/lib/views/CreateEventModal.ts
index 70196a988c..c7997c38ca 100644
--- a/packages/app-store/slackmessaging/lib/views/CreateEventModal.ts
+++ b/packages/app-store/slackmessaging/lib/views/CreateEventModal.ts
@@ -13,7 +13,7 @@ const CreateEventModal = (
         } | null;
       })
     | null,
-  invalidInput: boolean = false
+  invalidInput = false
 ) => {
   return Modal({ title: "Create Booking", submit: "Create", callbackId: "cal.event.create" })
     .blocks(
diff --git a/packages/app-store/slackmessaging/lib/views/TodayMessage.ts b/packages/app-store/slackmessaging/lib/views/TodayMessage.ts
index 8105c4efae..af304d0638 100644
--- a/packages/app-store/slackmessaging/lib/views/TodayMessage.ts
+++ b/packages/app-store/slackmessaging/lib/views/TodayMessage.ts
@@ -1,15 +1,15 @@
 import { Booking } from "@prisma/client";
 import dayjs from "dayjs";
-import { Modal, Blocks, Elements, Bits, Message } from "slack-block-builder";
+import { Blocks, Elements, Message } from "slack-block-builder";
 
-import { BASE_URL } from "@calcom/lib/constants";
+import { WEBAPP_URL } from "@calcom/lib/constants";
 
 const TodayMessage = (bookings: Booking[]) => {
   if (bookings.length === 0) {
     return Message()
       .blocks(Blocks.Section({ text: "You do not have any bookings for today." }))
       .asUser()
-      .buildToJSON();
+      .buildToObject();
   }
   return Message()
     .blocks(
@@ -18,7 +18,7 @@ const TodayMessage = (bookings: Booking[]) => {
       bookings.map((booking) =>
         Blocks.Section({
           text: `${booking.title} | ${dayjs(booking.startTime).format("HH:mm")}`,
-        }).accessory(Elements.Button({ text: "Cancel", url: `${BASE_URL}/cancel/${booking.uid}` }))
+        }).accessory(Elements.Button({ text: "Cancel", url: `${WEBAPP_URL}/cancel/${booking.uid}` }))
       )
     )
     .buildToObject();
diff --git a/packages/app-store/slackmessaging/package.json b/packages/app-store/slackmessaging/package.json
index 9d9cb9c0a7..92ee6b72f1 100644
--- a/packages/app-store/slackmessaging/package.json
+++ b/packages/app-store/slackmessaging/package.json
@@ -8,7 +8,8 @@
   "dependencies": {
     "@calcom/prisma": "*",
     "@slack/web-api": "^6.7.0",
-    "slack-block-builder": "^2.5.0"
+    "slack-block-builder": "^2.5.0",
+    "zod": "^3.17.3"
   },
   "devDependencies": {
     "@calcom/types": "*"
diff --git a/packages/prisma/zod-utils.ts b/packages/prisma/zod-utils.ts
index 162e760ef4..da4cef381c 100644
--- a/packages/prisma/zod-utils.ts
+++ b/packages/prisma/zod-utils.ts
@@ -67,7 +67,7 @@ export const bookingCreateBodySchema = z.object({
     })
     .optional(),
   eventTypeId: z.number(),
-  eventTypeSlug: z.string(),
+  eventTypeSlug: z.string().optional(),
   guests: z.array(z.string()).optional(),
   location: z.string(),
   name: z.string(),
@@ -81,10 +81,12 @@ export const bookingCreateBodySchema = z.object({
   bookingUid: z.string().optional(),
   customInputs: z.array(z.object({ label: z.string(), value: z.union([z.string(), z.boolean()]) })),
   metadata: z.record(z.string()),
-  hasHashedBookingLink: z.boolean(),
+  hasHashedBookingLink: z.boolean().optional(),
   hashedLink: z.string().nullish(),
 });
 
+export type BookingCreateBody = z.input<typeof bookingCreateBodySchema>;
+
 export const extendedBookingCreateBody = bookingCreateBodySchema.merge(
   z.object({
     noEmail: z.boolean().optional(),