> ## Documentation Index
> Fetch the complete documentation index at: https://cal.com/help/llms.txt
> Use this file to discover all available pages before exploring further.

# Booking Success Redirect Parameters

> Complete reference guide for query parameters forwarded to custom success pages after successful bookings

When a booking is successfully created in Cal.com, users can be redirected to a custom success page by enabling 'Redirect to a custom URL after a successful booking' option in the Event Type's Advanced settings page.
This guide documents all the query parameters that are forwarded to your custom success URL when 'Forward parameters' option is enabled (which is the default).

## Overview

Cal.com automatically appends booking information as query parameters to your custom success redirect URL. These parameters allow you to display booking details, or integrate with your own systems.

**Example redirect URL:**

```
https://yoursite.com/booking-success?uid=abc123&title=30min%20Meeting&startTime=2024-01-15T14%3A00%3A00.000Z&attendeeName=John%20Doe&email=john%40example.com
```

## Quick Reference

| Parameter           | Always Included | Description                                      |
| ------------------- | --------------- | ------------------------------------------------ |
| `uid`               | ✅               | Unique booking identifier                        |
| `title`             | ✅               | Event type title                                 |
| `startTime`         | ✅               | Start time in UTC                                |
| `endTime`           | ✅               | End time in UTC                                  |
| `email`             | ✅               | Primary attendee email                           |
| `isEmbed`           | ✅               | Boolean flag indicating embed booking            |
| `description`       | ⚠️              | Event description (when available)               |
| `location`          | ⚠️              | Meeting location (when set)                      |
| `hostName`          | ⚠️              | Host name(s) (when available)                    |
| `hostStartTime`     | ⚠️              | Start time in host timezone (when available)     |
| `attendeeName`      | ⚠️              | Attendee name (when available)                   |
| `attendeeStartTime` | ⚠️              | Start time in attendee timezone (when available) |
| `attendeeFirstName` | ⚠️              | First name from booking form (when provided)     |
| `attendeeLastName`  | ⚠️              | Last name from booking form (when provided)      |
| `guestEmails`       | ⚠️              | Guest emails (when guests added)                 |
| `phone`             | ⚠️              | Phone number (when provided)                     |

## Core Booking Parameters

**`uid`** - Unique identifier for the booking

* Always included
* Example: `9ybDCbazSYpJHthpxG5EDM`
* Usage: Use this to fetch additional booking details via API or store in your database

**`title`** - The event type title

* Always included
* Example: `30 Minute Meeting`

**`description`** - Event type description

* Included when event has description
* Example: `Quick sync meeting to discuss project updates`

**`startTime`** - ISO 8601 formatted start time in UTC

* Always included
* Example: `2024-01-15T14:00:00.000Z`

**`endTime`** - ISO 8601 formatted end time in UTC

* Always included
* Example: `2024-01-15T14:30:00.000Z`

**`location`** - Meeting location or video conference URL

* Included when location is set
* Example: `integrations:daily` (Cal Video), `integrations:zoom` (Zoom). More possible values [here](../bookings/prefill-fields#pre-selecting-a-video-meeting)

## Host/Organizer Parameters

**`hostName`** - Host name(s), comma-separated for multiple hosts

* Included when host information available
* Example: `Jane Smith,Mike Johnson`

**`hostStartTime`** - Start time formatted in host's timezone

* Included when host timezone available
* Example: `2024-01-15T09:00:00-05:00`

## Attendee Parameters

**`attendeeName`** - Name of the person who booked

* Included when primary attendee name available
* Example: `John Doe`

**`attendeeStartTime`** - Start time in attendee's timezone

* Included when attendee timezone available
* Example: `2024-01-15T06:00:00-08:00`

**`attendeeFirstName`** - First name from booking form

* Included when first name provided in booking form
* Example: `John`

**`attendeeLastName`** - Last name from booking form

* Included when last name provided in booking form
* Example: `Doe`

**`guestEmails`** - Comma-separated list of guest emails

* Included when additional guests added
* Example: `guest1@example.com, guest2@example.com`

## Booking Context Parameters

**`email`** - Primary attendee's email address

* Always included
* Example: `john@example.com`

**`phone`** - Phone number from booking form

* Included when phone number provided
* Example: `+1234567890`

## System Context Parameters

**`isEmbed`** - Boolean flag indicating if booking was made via embed

* Always included
* Example: `false`

## Troubleshooting

### Common Issues

**Missing Parameters**

* Some parameters are only included when data is available

**URL Encoding Issues**

* Always use `decodeURIComponent()` in JavaScript or equivalent in other languages
* Special characters like `@`, `+`, spaces are URL encoded

**Date/Time Handling**

* `startTime` and `endTime` are always in UTC (ISO 8601 format)
* `hostStartTime` and `attendeeStartTime` include timezone information
* Convert to local time as needed for display

### Security Considerations

* Always validate and sanitize parameters before using in database queries
* Don't trust parameter values - validate against your expected data types