curl -X DELETE https://api.relayer.fi/v1/transactions/sign/$TRANSACTION_ID \
  -H "Authorization: ApiKey $RELAYER_API_KEY"

// Cancel a transaction in awaiting_signature state. Once broadcast,
// cancellation is no longer possible via this endpoint.
const response = await fetch(
  `https://api.relayer.fi/v1/transactions/sign/${transactionId}`,
  {
    method: "DELETE",
    headers: { Authorization: `ApiKey ${process.env.RELAYER_API_KEY}` },
  },
);

import requests

url = "https://testnet.relayer.fi/v1/transactions/sign/{transactionId}"

headers = {"Authorization": "<api-key>"}

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

print(response.text)

const options = {method: 'DELETE', headers: {Authorization: '<api-key>'}};

fetch('https://testnet.relayer.fi/v1/transactions/sign/{transactionId}', 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://testnet.relayer.fi/v1/transactions/sign/{transactionId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "DELETE",
  CURLOPT_HTTPHEADER => [
    "Authorization: <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"
	"net/http"
	"io"
)

func main() {

	url := "https://testnet.relayer.fi/v1/transactions/sign/{transactionId}"

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

	req.Header.Add("Authorization", "<api-key>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.delete("https://testnet.relayer.fi/v1/transactions/sign/{transactionId}")
  .header("Authorization", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://testnet.relayer.fi/v1/transactions/sign/{transactionId}")

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

request = Net::HTTP::Delete.new(url)
request["Authorization"] = '<api-key>'

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