curl --request POST \
  --url https://api.railmail.app/api/v1/campaigns \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data @- <<EOF
{
  "name": "June Newsletter",
  "subject": "Your June update",
  "previewText": "What's new this month",
  "contentJson": "{\"blocks\":[]}",
  "fromEmail": "news@example.com",
  "fromName": "Example",
  "topicIds": [
    "7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f"
  ],
  "segmentIds": [],
  "sendStrategy": "DRAFT"
}
EOF

import requests

url = "https://api.railmail.app/api/v1/campaigns"

payload = {
    "name": "June Newsletter",
    "subject": "Your June update",
    "previewText": "What's new this month",
    "contentJson": "{\"blocks\":[]}",
    "fromEmail": "news@example.com",
    "fromName": "Example",
    "topicIds": ["7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f"],
    "segmentIds": [],
    "sendStrategy": "DRAFT"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'June Newsletter',
    subject: 'Your June update',
    previewText: 'What\'s new this month',
    contentJson: '{"blocks":[]}',
    fromEmail: 'news@example.com',
    fromName: 'Example',
    topicIds: ['7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f'],
    segmentIds: [],
    sendStrategy: 'DRAFT'
  })
};

fetch('https://api.railmail.app/api/v1/campaigns', 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.railmail.app/api/v1/campaigns",
  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([
    'name' => 'June Newsletter',
    'subject' => 'Your June update',
    'previewText' => 'What\'s new this month',
    'contentJson' => '{"blocks":[]}',
    'fromEmail' => 'news@example.com',
    'fromName' => 'Example',
    'topicIds' => [
        '7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f'
    ],
    'segmentIds' => [
        
    ],
    'sendStrategy' => 'DRAFT'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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.railmail.app/api/v1/campaigns"

	payload := strings.NewReader("{\n  \"name\": \"June Newsletter\",\n  \"subject\": \"Your June update\",\n  \"previewText\": \"What's new this month\",\n  \"contentJson\": \"{\\\"blocks\\\":[]}\",\n  \"fromEmail\": \"news@example.com\",\n  \"fromName\": \"Example\",\n  \"topicIds\": [\n    \"7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f\"\n  ],\n  \"segmentIds\": [],\n  \"sendStrategy\": \"DRAFT\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	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.railmail.app/api/v1/campaigns")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"June Newsletter\",\n  \"subject\": \"Your June update\",\n  \"previewText\": \"What's new this month\",\n  \"contentJson\": \"{\\\"blocks\\\":[]}\",\n  \"fromEmail\": \"news@example.com\",\n  \"fromName\": \"Example\",\n  \"topicIds\": [\n    \"7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f\"\n  ],\n  \"segmentIds\": [],\n  \"sendStrategy\": \"DRAFT\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.railmail.app/api/v1/campaigns")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"June Newsletter\",\n  \"subject\": \"Your June update\",\n  \"previewText\": \"What's new this month\",\n  \"contentJson\": \"{\\\"blocks\\\":[]}\",\n  \"fromEmail\": \"news@example.com\",\n  \"fromName\": \"Example\",\n  \"topicIds\": [\n    \"7b9c1f2e-2a1d-4d8a-9b1f-7e6c5d4b3a2f\"\n  ],\n  \"segmentIds\": [],\n  \"sendStrategy\": \"DRAFT\"\n}"

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

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "campaignKey": "<string>",
  "name": "<string>",
  "subject": "<string>",
  "previewText": "<string>",
  "contentJson": "<string>",
  "contentText": "<string>",
  "status": "<string>",
  "sendStrategy": "<string>",
  "topicIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "segmentIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "estimatedRecipientCount": 123,
  "scheduledAt": "2023-11-07T05:31:56Z",
  "completedAt": "2023-11-07T05:31:56Z",
  "fromEmail": "<string>",
  "fromName": "<string>",
  "preSendScore": 123,
  "preSendStatus": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z"
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}

{
  "type": "<string>",
  "title": "<string>",
  "status": 123,
  "detail": "<string>",
  "instance": "<string>",
  "timestamp": "2023-11-07T05:31:56Z",
  "errors": {}
}