API + Webhook Help

We have the new endpoint out, which is great. Is there any way to reschedule an event? Seems like the only workaround is to cancel, and then rebook it. Kind of annoying to have to do a round trip (since there’s multiple emails / texts / workflows with each event). Thanks!

We’ve heard your requests, and we’re excited to announce a Scheduling API will be available soon! With the new Create Event Invitee endpoint, you’ll be able to:Programmatically schedule Calendly meetings on behalf of invitees Skip redirects, iframes, and Calendly-hosted UI for a smoother, fully embedded experience Fully enable scheduling use cases like AI Agents, workflow automations, and custom portalsWant to be notified when it’s available? Sign up for our Developer Newsletter to be the first to know when APIs and developer resources go live. – The Calendly Developer Team

 Hello everyone,I'm trying to create an event (a meeting) through the Calendly API, following the official documentation. However, when I send a request to https://api.calendly.com/scheduled_events/, I keep getting a 404 error.Here’s what I’ve checked so far:✅ Using a POST request with the required payload✅ Ensuring my authentication token is correct✅ Double-checking the API URL and version✅ Tried testing with https://api.calendly.com/users/me (authentication works fine)Has anyone else faced this issue? Any suggestions on what might be missing or how to fix it? Would appreciate any insights!Thanks in advance! 

I saw a few posts ranging from years to months ago requesting a “scheduling API” to be launched. I wanted to know if this was any closer to becoming a reality, if there was a timeline / early access option.To be honest, it seems crazy to me that this has not been launched.I’m currently working with clients to add Voice based scheduling, which is useful for both organic bookings, and for accessibility with visually impaired users. Naturally a lot of clients are already using Calendly. As it stands as we cannot schedule events from user data, the only thing I can do is encourage people to migrate away from your service because of this limitation - which seems pretty sad since you’ve often been a staple supplier.This seems like a big miss that is going to get worse very quickly as AI increases the volume of non-traditional booking interfaces being used - if you haven’t I would ask you to reconsider.

We are trying to create an event (a meeting) through the API but when doing it as in its documentation it sends me a 404 errorhttps://api.calendly.com/scheduled_events/ Does anyone know how to achieve this?

Hi, using n8n i want to create/book the appointment but don’t know how to do can anybody tell that how to do it???

I’m reaching out to request a critical feature for Calendly’s API: an endpoint to schedule events programmatically without requiring invitees to select a time slot via a scheduling link. This capability is essential for my business, and I believe it would benefit many other developers in the community as well. The ProblemMy team is building AI solutions in a highly competitive industry where scheduling needs to be seamless and immediate—often over the phone or through automated workflows. Currently, Calendly’s API (as of March 2025) allows us to fetch availability and event details, but there’s no way to directly schedule an event. Instead, we’re forced to send a scheduling link or direct clients to a website to book, which isn’t feasible for our use case. This limitation creates friction:Clients expect instant scheduling during live interactions (e.g., phone calls to our Voice AI agent or via SMS chat with our AI agent). Sending a link or requiring a website visit adds unnecessary ste

Hi everyone,I’m working on an integration where I need to use the Calendly API V2 to schedule events, and I plan to do this through a WhatsApp API. Could anyone provide guidance on how to authenticate and interact with the Calendly API to create new events? Specifically, I want to allow users to schedule meetings directly via WhatsApp.Any advice or example code would be greatly appreciated!Thank you in advance!

Dear Calendly Support,I hope this message finds you well.I'm reaching out to inquire about the availability of APIs for scheduling events within Calendly. As part of our integration plans, we're interested in programmatically scheduling events via the API directly. However, upon reviewing the current documentation and resources, it appears that such functionality is not yet available.Could you please provide information on whether there are plans to introduce APIs for event scheduling in the near future? Understanding the roadmap for API development would greatly assist us in our integration planning and decision-making process.Your assistance in this matter is highly appreciated. Thank you for your attention to this inquiry, and I look forward to hearing from you soon.Best regards,Hassan MemonSoftware Engineer - Techwardshassan.ghaddai@gmail.com

Hi Folks, I started recently started to integrate the calendar schedule to one of our customers.However, I came across the fact that we cannot Schedule an event from API.Something that for me was very obvious which could be done.In the best option, we could prefill an event link but still the customer have to submit the form. Our usecase is an AI agent integration, making the schedule directly from the conversation flow. I honestly, need to understand the decision behind a calendar schedule tool to not make available the endpoint to schedule and event, which at the end is all its built for…. Could you guys try to explain the decision behind it so I can tell my customer about it?Regards,

We use Calendly to make appointments for Cat adoption events.  People are making appointments and it appears the appointments are being cancelled the morning of by the system.  We troubleshot a few things: Made an appointment and intentionally did not cancel it on our end.  Result:  Was auto cancelled morning of.   Changed the password and turned on 2 factor authentication to ensure it wasn’t a mistake on our end.  Did NOT give out any of the information and just let it sit there and did not log in at all.  Result:  appointment that we created was auto cancelled.  I do not see anything in the settings that could do this.  The cancellations remove the event from the calendar and put the event in the trash of the email associated with the account. 

Hi everyone,I’m trying to correctly pass Google Ads GCLID parameters through Calendly to my website’s booking confirmation page, so that conversions can be attributed back to Google Ads in GA4.Here’s my setup: My Google Ads and GA4 accounts are linked correctly. My website uses Google Tag Manager (GTM) with a GA4 event tag booking_confirmation that fires when the user lands on:https://xxxx.de/pages/booking-confirmation Calendly is used for booking consultations, and after a booking I redirect users to that confirmation page using:After booking → Redirect to an external site → Redirect URL:https://xxxx.de/pages/booking-confirmation The issue is:I need to pass the gclid parameter from the original Google Ads click through Calendly to my confirmation page, but Calendly doesn’t accept dynamic parameters like {gclid} in the redirect URL (it shows “Not a valid URL” when I try ?gclid={gclid}).As a result, my GA4 event tracks bookings, but Google Ads doesn’t register any conversions — ever

Hi all, I’ll preface by saying I’m not a developer by profession, so my code might not be up to industry standards. I’ve created a tool for work called “multi_cal” that has a few utility features that Calendly does not offer (or only partially offers) on its own. Currently, it is based in Google Apps-Script and runs off a host email account that communicates with Calendly via workflows. I recognize that this is probably inefficient, but there are two reasons for this: the first is that, as stated, I am not a developer, and the second is that I wanted other people in my department to be able to set it up for themselves relatively easily and without requiring intervention on my part (that made fiddling with OAuth and other intricacies a little out of scope). The FeaturesShared Resource KeywordsCalendly is great for managing a single individual’s calendar, but it starts to struggle when different hosts are trying to schedule for the same resources (say a certain room or piece of equipment

Hi all, I can absolutely not wrap my head around this problem. So I’ve implemented the OAuth2 flow for 3 different environments for my application: local, acceptance and production. For local and production everything seems to be working fine, however, for my acceptance environment I keep getting the following error: Missing required parameter: code_verifier.The redirect URI and the environment type for the Calendly Integration app have been set accordingly. I’ve even played switched the environment setting for the Calendly app from Sandbox to Production and vice versa, but no success. The only difference between production and acceptance is the redirect URI, where the production domain is on app.example.com and the acceptance is on app-acc.example.com I just cannot understand why this error appears for one environment and not the other. I need some insight here….

I’m trying to reschedule a meeting in the app. I prefer to use the app for this because it lets me see overall availability and sometimes I need to override another meeting, I can’t see how to do this on the website any more. Am I missing something here?I get an error message: Sorry! the operation couldn’t be completed (CalendlyKit APIError error 1) So the appt wasn’t rescheduled. I try it on my other device and it says Sorry! That start time has been filled. What do I need to do?

I have  https://www.calendly.com/jjj-testing/?utm_medium=social&utm_source=facebook&utm_campaign=summer%20promotion&salesforce_uuid=ffeddb07-041a-4df0-9f22-999c6c7a0740&name=Fredy%20Haag&email=fredyU.haag%40autotest.com when I visit this link utm_* is removed but salesforce_uuid stays in place. In the result I receive only salesforce_uuid in webhook. Why this happens and how to prevent removing of UTM? 

Hi,Objective:Create a unique calendar link for property viewings.Issue:I need each booking link to include pre-qualifying questions (e.g. household size, pets, etc.), but I can’t find a way to create one-off events with custom questions programmatically.Methods attempted: Tried using the API to create one-off events, but custom questions aren’t supported. Looked into creating a standard event type via the API, but that doesn’t allow custom questions either. Question:Is there a way to automate the creation of events (one-off or otherwise) that include custom questions, or is the only option to set up event types manually in the Calendly UI?Thanks

Our organization needs professional consultation for a calendly deployment and advanced development capabilities. Timespan of the consultation should last about 3 weeks.  

Greetings everyone, We use this option in the mobile app to hide the cookie banner, unfortunately, this option does not seem to work anymore. Is this isolate or did other people report this issue ?I was able to replicate this issue by simply appending “<event_url>?hide_gdpr_banner=1” to an event URL. Could the Calendly team take a look at this ? We operate from Belgium if that can help.

Hi,Looking at api doc it requires to delete a webhook to pass webhook_uuid in the body of the message(https://developer.calendly.com/api-docs/565b97f62dafe-delete-webhook-subscription) But how I am supposed to know this uuid ?Both webhook creation and list api calls don’t returns it. Am I missing something or something is broken ?

Hi, I am trying to create a custom book an event button in Salesforce, but the information is not carrying over. I followed this article: https://help.calendly.com/hc/en-us/articles/360057224874-How-to-schedule-Calendly-meetings-from-Salesforce#h_01HB9EEWV7K6W791REN257T29Q.  I used the formula:ADD_YOUR_LINK?sfid={!Opportunity.Id}&name={!Contact.FirstName}%20{!Contact.LastName}&email={!Lead.Email}                                      I changed to the Calendly page link. When I click on the button, it redirects me to the scheduling page, but only the first and last name information is carried over. I also need the email address and the mobile number. What am I doing wrong?

Hi all,I’m using the Calendly API in a Power Automate flow, specifically the https://api.calendly.com/scheduled_events endpoint inside a HTTP call. As of this morning, the flow is failing with the error below. No changes have been made to the flow or the action in weeks. “The access token is invalid” I’ve already tried generating a new API token, and I can confirm the token works fine when tested in Postman. The issue only seems to occur in Power Automate. Here’s the call structure from my flow:  URI: https://api.calendly.com/scheduled_events Method: GET Headers: Authorization: Bearer <Token> Content-Type: application/json Query Params: Organization: https://api.calendly.com/organizations/<org_id>  Has anyone else run into this issue with Power Automate? Any ideas on why the token would work in Postman but fail inside a flow? Or what’s changed in the last week to make it fail?

Bonjour, je souhaiterai modifier mon moyen de paiement. Actuellement, il s’agit d’un prélèvement mensuel depuis Paypal et j’aimerai le changer pour un prélèvement bancaire.  Merci d’avance pour le retour

Calendly is not connecting to the Outlook calendar I need it to connect with (my business calendar). It says that it's connected (yes, my personal calendar) and will not allow me to add another domain; any suggestions?