Signing a Message

    <?php
    class API {
        public function __construct($key, $secret, $passphrase) {
          $this->key = $key;
          $this->secret = $secret;
          $this->passphrase = $passphrase;
        }

        public function signature($request_path = '', $body = '', $timestamp = false, $method = 'GET') {

          $body = is_array($body) ? json_encode($body) : $body; // Body must be in json format

          $timestamp = $timestamp ? $timestamp : time() * 1000;

          $what = $timestamp . $method . $request_path . $body;

          return base64_encode(hash_hmac("sha256", $what, $this->secret, true));
        }
    }
    ?>

    Spot
    #Example for get balance of accounts in python

    api_key = "api_key"
    api_secret = "api_secret"
    api_passphrase = "api_passphrase"
    url = 'https://api.kucoin.com/api/v1/accounts'
    now = int(time.time() * 1000)
    str_to_sign = str(now) + 'GET' + '/api/v1/accounts'
    signature = base64.b64encode(
        hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest())

    passphrase = base64.b64encode(hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest())
    headers = {
        "KC-API-SIGN": signature,
        "KC-API-TIMESTAMP": str(now),
        "KC-API-KEY": api_key,
        "KC-API-PASSPHRASE": passphrase,
        "KC-API-KEY-VERSION": "2"
    }
    response = requests.request('get', url, headers=headers)
    print(response.status_code)
    print(response.json())

    #Example for create deposit addresses in python
    url = 'https://api.kucoin.com/api/v1/deposit-addresses'
    now = int(time.time() * 1000)
    data = {"currency": "BTC"}
    data_json = json.dumps(data)
    str_to_sign = str(now) + 'POST' + '/api/v1/deposit-addresses' + data_json
    signature = base64.b64encode(
        hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest())
    passphrase = base64.b64encode(
        hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest())
    headers = {
        "KC-API-SIGN": signature,
        "KC-API-TIMESTAMP": str(now),
        "KC-API-KEY": api_key,
        "KC-API-PASSPHRASE": passphrase,
        "KC-API-KEY-VERSION": 2,
        "Content-Type": "application/json" # specifying content type or using json=data in request
    }
    response = requests.request('post', url, headers=headers, data=data_json)
    print(response.status_code)
    print(response.json())

    Futures
    #Example for get user position in python

    api_key = "api_key"
    api_secret = "api_secret"
    api_passphrase = "api_passphrase"
    url = 'https://api-futures.kucoin.com/api/v1/position?symbol=XBTUSDM'
    now = int(time.time() * 1000)
    str_to_sign = str(now) + 'GET' + '/api/v1/position?symbol=XBTUSDM'
    signature = base64.b64encode(
        hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest())
    passphrase = base64.b64encode(hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest())
    headers = {
        "KC-API-SIGN": signature,
        "KC-API-TIMESTAMP": str(now),
        "KC-API-KEY": api_key,
        "KC-API-PASSPHRASE": passphrase
        "KC-API-KEY-VERSION": "2"
    }
    response = requests.request('get', url, headers=headers)
    print(response.status_code)
    print(response.json())

    #Example for create deposit addresses in python
    url = 'https://api-futures.kucoin.com/api/v1/deposit-address'
    now = int(time.time() * 1000)
    data = {"currency": "XBT"}
    data_json = json.dumps(data)
    str_to_sign = str(now) + 'POST' + '/api/v1/deposit-address' + data_json
    signature = base64.b64encode(
        hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest())
    passphrase = base64.b64encode(hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest())
    headers = {
        "KC-API-SIGN": signature,
        "KC-API-TIMESTAMP": str(now),
        "KC-API-KEY": api_key,
        "KC-API-PASSPHRASE": passphrase,
        "KC-API-KEY-VERSION": "2",
        "Content-Type": "application/json" # specifying content type or using json=data in request
    }
    response = requests.request('post', url, headers=headers, data=data_json)
    print(response.status_code)
    print(response.json())

For the header of KC-API-SIGN:

• Use API-Secret to encrypt the prehash string {timestamp+method+endpoint+body} with sha256 HMAC. The request body is a JSON string and need to be the same with the parameters passed by the API.
• After that, use base64-encode to encrypt the result in step 1 again.

For the KC-API-PASSPHRASE of the header:

• For API key-V1.0, please pass requests in plaintext.
• For API key-V2.0, please Specify KC-API-KEY-VERSION as 2 --> Encrypt passphrase with HMAC-sha256 via API-Secret --> Encode contents by base64 before you pass the request."

Notice:

• The encrypted timestamp shall be consistent with the KC-API-TIMESTAMP field in the request header.
• The body to be encrypted shall be consistent with the content of the Request Body.
• The Method should be UPPER CASE.
• For GET, DELETE request, the endpoint needs to contain the query string. e.g. /api/v1/deposit-addresses?currency=XBT. The body is "" if there is no request body (typically for GET requests).

#Example for Create Deposit Address

curl -H "Content-Type:application/json" -H "KC-API-KEY:5c2db93503aa674c74a31734" -H "KC-API-TIMESTAMP:1547015186532" -H "KC-API-PASSPHRASE:QWIxMjM0NTY3OCkoKiZeJSQjQA==" -H "KC-API-SIGN:7QP/oM0ykidMdrfNEUmng8eZjg/ZvPafjIqmxiVfYu4="  -H "KC-API-KEY-VERSION:2"
-X POST -d '{"currency":"BTC"}' http://api.kucoin.com/api/v1/deposit-addresses

KC-API-KEY = 5c2db93503aa674c74a31734
KC-API-SECRET = f03a5284-5c39-4aaa-9b20-dea10bdcf8e3
KC-API-PASSPHRASE = QWIxMjM0NTY3OCkoKiZeJSQjQA==
KC-API-KEY-VERSION = 2
TIMESTAMP = 1547015186532
METHOD = POST
ENDPOINT = /api/v1/deposit-addresses
STRING-TO-SIGN = 1547015186532POST/api/v1/deposit-addresses{"currency":"BTC"}
KC-API-SIGN = 7QP/oM0ykidMdrfNEUmng8eZjg/ZvPafjIqmxiVfYu4=