One-click unsubscribe from a win-back email

curl --request POST \
  --url https://api.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data List-Unsubscribe=One-Click

import requests

url = "https://api.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click"

payload = { "List-Unsubscribe": "One-Click" }
headers = {"Content-Type": "application/x-www-form-urlencoded"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/x-www-form-urlencoded'},
  body: new URLSearchParams({'List-Unsubscribe': 'One-Click'})
};

fetch('https://api.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click', 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.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "List-Unsubscribe=One-Click",
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/x-www-form-urlencoded"
  ],
]);

$response = curl_exec($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.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click"

	payload := strings.NewReader("List-Unsubscribe=One-Click")

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

	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")

	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.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click")
  .header("Content-Type", "application/x-www-form-urlencoded")
  .body("List-Unsubscribe=One-Click")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fluid.app/api/checkout/v2026-04/win-back-offer/unsubscribe/one-click")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/x-www-form-urlencoded'
request.body = "List-Unsubscribe=One-Click"

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

{
  "unsubscribed": true,
  "meta": {
    "request_id": "6f1c2a9e-3b7d-4e58-9a21-c4d8e0b7f312",
    "timestamp": "2027-04-20T15:00:00Z"
  }
}

{
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z",
    "code": "<string>",
    "payment_uuid": "<string>",
    "error_details": [
      {
        "code": "<string>",
        "field": "<string>",
        "payment": "not_attempted",
        "message": "<string>"
      }
    ],
    "coded_recovery": true
  }
}

{
  "error_message": "<string>",
  "errors": "<string>",
  "meta": {
    "request_id": "<string>",
    "timestamp": "2023-11-07T05:31:56Z",
    "code": "<string>",
    "payment_uuid": "<string>",
    "error_details": [
      {
        "code": "<string>",
        "field": "<string>",
        "payment": "not_attempted",
        "message": "<string>"
      }
    ],
    "coded_recovery": true
  }
}