curl --request PUT \
  --url https://api.sendkit.dev/campaigns/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "subject": "<string>",
  "email_template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "sender_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "audience_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "preview_text": "<string>",
  "reply_to": "jsmith@example.com",
  "scheduled_at": "2023-11-07T05:31:56Z"
}
'

import requests

url = "https://api.sendkit.dev/campaigns/{id}"

payload = {
    "name": "<string>",
    "subject": "<string>",
    "email_template_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "sender_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "audience_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "preview_text": "<string>",
    "reply_to": "jsmith@example.com",
    "scheduled_at": "2023-11-07T05:31:56Z"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: '<string>',
    subject: '<string>',
    email_template_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    sender_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    audience_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    preview_text: '<string>',
    reply_to: 'jsmith@example.com',
    scheduled_at: '2023-11-07T05:31:56Z'
  })
};

fetch('https://api.sendkit.dev/campaigns/{id}', 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.sendkit.dev/campaigns/{id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => '<string>',
    'subject' => '<string>',
    'email_template_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'sender_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'audience_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'preview_text' => '<string>',
    'reply_to' => 'jsmith@example.com',
    'scheduled_at' => '2023-11-07T05:31:56Z'
  ]),
  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.sendkit.dev/campaigns/{id}"

	payload := strings.NewReader("{\n  \"name\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"email_template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"sender_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"audience_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"preview_text\": \"<string>\",\n  \"reply_to\": \"jsmith@example.com\",\n  \"scheduled_at\": \"2023-11-07T05:31:56Z\"\n}")

	req, _ := http.NewRequest("PUT", 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.put("https://api.sendkit.dev/campaigns/{id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"email_template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"sender_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"audience_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"preview_text\": \"<string>\",\n  \"reply_to\": \"jsmith@example.com\",\n  \"scheduled_at\": \"2023-11-07T05:31:56Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sendkit.dev/campaigns/{id}")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"<string>\",\n  \"subject\": \"<string>\",\n  \"email_template_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"sender_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"audience_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"preview_text\": \"<string>\",\n  \"reply_to\": \"jsmith@example.com\",\n  \"scheduled_at\": \"2023-11-07T05:31:56Z\"\n}"

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

{
  "id": "550e8400-e29b-41d4-a716-446655440000",
  "name": "March Newsletter",
  "subject": "Our latest updates",
  "preview_text": "Check out what's new",
  "reply_to": "support@example.com",
  "status": "draft",
  "audience_type": "contact_list",
  "audience_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "template": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "Newsletter Template"
  },
  "sender": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "Marketing Team",
    "email": "marketing@example.com"
  },
  "total_recipients": 1500,
  "sent_count": 1200,
  "failed_count": 5,
  "scheduled_at": "2026-03-15 10:00:00",
  "sent_at": "2026-03-11 14:30:00",
  "created_at": "2026-03-10 09:00:00"
}

{
  "message": "Invalid API key."
}

{
  "message": "Not found."
}

{
  "message": "The email field is required."
}