Calendar
Cancel a booking
Releases the slot, removes the calendar event, tells the attendee and fires webhooks. This is not a bookkeeping change, so only do it when the meeting really is off. Cancelling an already-cancelled booking succeeds rather than erroring. Requires scope calendar:write.
POST
/
calendar
/
bookings
/
{id}
/
cancel
Cancel a booking
curl --request POST \
--url https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"reason": "<string>"
}
'import requests
url = "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel"
payload = { "reason": "<string>" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({reason: '<string>'})
};
fetch('https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'reason' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel"
payload := strings.NewReader("{\n \"reason\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"reason\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"reason\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"data": {
"ok": true,
"status": "cancelled",
"already_cancelled": true
},
"meta": {
"request_id": "req_9f3a2b1c-7d4e-4a08-b2c6-5e1f8a9d0c34",
"timestamp": "2026-07-26T09:41:22Z"
}
}Authorizations
API key from Developer dashboard (Bearer token).
Path Parameters
Booking id, as it appears on the CRM contact's bookings.
Body
application/json
Shown to the attendee. Worth filling in - a blank notice reads badly.
⌘I
Cancel a booking
curl --request POST \
--url https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"reason": "<string>"
}
'import requests
url = "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel"
payload = { "reason": "<string>" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({reason: '<string>'})
};
fetch('https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'reason' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel"
payload := strings.NewReader("{\n \"reason\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"reason\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.smartlyq.com/v1/calendar/bookings/{id}/cancel")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"reason\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"data": {
"ok": true,
"status": "cancelled",
"already_cancelled": true
},
"meta": {
"request_id": "req_9f3a2b1c-7d4e-4a08-b2c6-5e1f8a9d0c34",
"timestamp": "2026-07-26T09:41:22Z"
}
}
