curl --request POST \
  --url https://api.whop.com/api/v1/memberships/{id}/apply_promo_code \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "promo_code": "SAVE20"
}
'

import requests

url = "https://api.whop.com/api/v1/memberships/{id}/apply_promo_code"

payload = { "promo_code": "SAVE20" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({promo_code: 'SAVE20'})
};

fetch('https://api.whop.com/api/v1/memberships/{id}/apply_promo_code', 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.whop.com/api/v1/memberships/{id}/apply_promo_code",
  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([
    'promo_code' => 'SAVE20'
  ]),
  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.whop.com/api/v1/memberships/{id}/apply_promo_code"

	payload := strings.NewReader("{\n  \"promo_code\": \"SAVE20\"\n}")

	req, _ := http.NewRequest("POST", 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.post("https://api.whop.com/api/v1/memberships/{id}/apply_promo_code")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"promo_code\": \"SAVE20\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.whop.com/api/v1/memberships/{id}/apply_promo_code")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"promo_code\": \"SAVE20\"\n}"

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

{
  "account": {
    "id": "biz_xxxxxxxxxxxxxx",
    "logo_url": "https://whop-assets-example.s3.amazonaws.com/uploads/image/2026-01-01/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
    "route": "shine-time-auto-detailing",
    "title": "Shine Time Auto Detailing"
  },
  "billing_period_days": 30,
  "cancel_at_period_end": true,
  "canceled_at": "2026-01-01T12:00:00.000Z",
  "cancellation_reason": "Too expensive",
  "created_at": "2026-01-01T12:00:00.000Z",
  "current_period_end": "2026-01-01T12:00:00.000Z",
  "current_period_start": "2026-01-01T12:00:00.000Z",
  "id": "mem_xxxxxxxxxxxxxx",
  "license_key": "WHOP-XXXX-XXXX-XXXX",
  "manage_url": "https://whop.com/billing/manage/mber_xxxxxxxxxxxxxx",
  "member": {
    "access_level": "customer",
    "last_accessed_at": "2026-01-01T12:00:00.000Z",
    "position": 1767268800000
  },
  "metadata": {},
  "phone_number": "+xxxxxxxxxxx",
  "plan_id": "plan_xxxxxxxxxxxxxx",
  "product_id": "prod_xxxxxxxxxxxxxx",
  "promo_code_id": "promo_xxxxxxxxxxxxxx",
  "status": "active",
  "updated_at": "2026-01-01T12:00:00.000Z",
  "user_id": "user_xxxxxxxxxxxxxx"
}

{
  "error": {
    "message": "account_id is required",
    "type": "bad_request",
    "code": "<string>"
  }
}

{
  "error": {
    "message": "account_id is required",
    "type": "bad_request",
    "code": "<string>"
  }
}

{
  "error": {
    "message": "account_id is required",
    "type": "bad_request",
    "code": "<string>"
  }
}

{
  "error": {
    "message": "account_id is required",
    "type": "bad_request",
    "code": "<string>"
  }
}