# `CCXT.Signing.HmacSha256Kucoin`
[🔗](https://github.com/ZenHive/ccxt_client/blob/main/lib/ccxt/signing/hmac_sha256_kucoin.ex#L1)

HMAC-SHA256 with HMAC-signed passphrase (KuCoin-style).

Used by: KuCoin, KuCoin Futures, and ~3 other exchanges.

## How it works

1. Create millisecond timestamp
2. Build payload: `timestamp + METHOD + endpoint + body`
3. Sign payload with HMAC-SHA256, encode as Base64
4. Also sign the passphrase with HMAC-SHA256 (v2 API keys)
5. Send all in headers

## Configuration

    signing: %{
      pattern: :hmac_sha256_passphrase_signed,
      api_key_header: "KC-API-KEY",
      timestamp_header: "KC-API-TIMESTAMP",
      signature_header: "KC-API-SIGN",
      passphrase_header: "KC-API-PASSPHRASE",
      api_key_version_header: "KC-API-KEY-VERSION",
      api_key_version: "2"
    }

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*Consult [api-reference.md](api-reference.md) for complete listing*