> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.pinnacle.sh/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.pinnacle.sh/_mcp/server.

# Cancel Scheduled Message

DELETE https://api.pinnacle.sh/messages/schedule/{id}

Cancel a scheduled message or blast. 

Works for both individual scheduled messages and scheduled blasts. Use the `scheduleId` returned when the message or blast was scheduled.

Reference: https://docs.pinnacle.sh/api-reference/messages/cancel-scheduled-message

## Authentication

- `PINNACLE-API-KEY` header (required) — API Key authentication via header

## Request

### Path parameters

- `id` (string, required) — Unique identifier of the scheduled message. This identifier is a string that always begins with the prefix `msg_sched_`, for example: `msg_sched_1234567890`.

## Response

### 200

Successfully cancelled the scheduled message or blast.

- `success` (boolean, required) — Indicates whether the schedule was successfully cancelled.

## Errors

### 400 Bad Request Error

The request was unacceptable, often due to providing an invalid update.  Errors may originate from invalid payload or from Pinnacle's additional validation checks. For example, providing an URL that cannot be accessed, updating a campaign that is currently being reviewed, updating data that you cannot access, sending a malformed message, and so on.  For `Pinnacle Validation Error` inspect the `error` payload to determine the source of the failure. These errors are likely due to additional validation and business logic checks. For `Request Validation Error` inspect the `description` and `errors` payload to determine the source of failure. These errors are likely due to invalid payload inside the request.

- `CancelScheduledMessageRequestBadRequestError`

### 401 Unauthorized Error

The request lacks valid authentication credentials or the provided credentials are invalid.  Ensure you're including a valid API key in the request headers and that your account has the necessary permissions to access this endpoint.

- `error` (string, required) — Human-readable description of the error that occurred, corresponding to the HTTP status code.

### 403 Forbidden Error

Your subscription does not include access to this feature.  This occurs when attempting to use functionality that requires a higher subscription tier. Please upgrade your subscription to access this feature.

- `error` (string, required) — Human-readable description of the error that occurred, corresponding to the HTTP status code.

### 404 Not Found Error

Schedule not found or has already completed.

- `error` (string, optional)

### 500 Internal Server Error

An unexpected error occurred on Pinnacle's servers while processing your request.  If this error persists, please contact support with the request details.

- `error` (string, required) — Human-readable description of the error that occurred, corresponding to the HTTP status code.

### 501 Not Implemented Error

The requested functionality is not implemented on the server.  This typically indicates that the feature or endpoint you attempted to access is unavailable or not yet supported.

- `error` (string, required) — Human-readable description of the error that occurred, corresponding to the HTTP status code.

## Types

### ZodError

- `description` (string, required) — Human-readable summary of validation failures.
- `errors` (ZodErrorErrors, required) — Structured dictionary of issues containing two main sections: - `errors`: Array of global validation errors not tied to specific fields - `properties`: Object mapping field names to their specific validation errors, where each field contains an `errors` array

### Error

Standard error response returned when a request cannot be processed successfully.

- `error` (string, required) — Human-readable description of the error that occurred, corresponding to the HTTP status code.

### ZodErrorErrors

Structured dictionary of issues containing two main sections: - `errors`: Array of global validation errors not tied to specific fields - `properties`: Object mapping field names to their specific validation errors, where each field contains an `errors` array

## Examples

**Response**

```json
{
  "success": true
}
```

**SDK Code**

```python Cancelled Scheduled Message
import requests

url = "https://api.pinnacle.sh/messages/schedule/id"

headers = {"PINNACLE-API-KEY": "<apiKey>"}

response = requests.delete(url, headers=headers)

print(response.json())
```

```javascript Cancelled Scheduled Message
const url = 'https://api.pinnacle.sh/messages/schedule/id';
const options = {method: 'DELETE', headers: {'PINNACLE-API-KEY': '<apiKey>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go Cancelled Scheduled Message
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.pinnacle.sh/messages/schedule/id"

	req, _ := http.NewRequest("DELETE", url, nil)

	req.Header.Add("PINNACLE-API-KEY", "<apiKey>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby Cancelled Scheduled Message
require 'uri'
require 'net/http'

url = URI("https://api.pinnacle.sh/messages/schedule/id")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Delete.new(url)
request["PINNACLE-API-KEY"] = '<apiKey>'

response = http.request(request)
puts response.read_body
```

```java Cancelled Scheduled Message
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.delete("https://api.pinnacle.sh/messages/schedule/id")
  .header("PINNACLE-API-KEY", "<apiKey>")
  .asString();
```

```php Cancelled Scheduled Message
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('DELETE', 'https://api.pinnacle.sh/messages/schedule/id', [
  'headers' => [
    'PINNACLE-API-KEY' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp Cancelled Scheduled Message
using RestSharp;

var client = new RestClient("https://api.pinnacle.sh/messages/schedule/id");
var request = new RestRequest(Method.DELETE);
request.AddHeader("PINNACLE-API-KEY", "<apiKey>");
IRestResponse response = client.Execute(request);
```

```swift Cancelled Scheduled Message
import Foundation

let headers = ["PINNACLE-API-KEY": "<apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.pinnacle.sh/messages/schedule/id")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "DELETE"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```