# `CCXT.Signing.HmacSha384Payload`
[🔗](https://github.com/ZenHive/ccxt_client/blob/main/lib/ccxt/signing/hmac_sha384_payload.ex#L1)

HMAC-SHA384 payload signing pattern (Bitfinex/Gemini-style).

Used by: Bitfinex, Gemini, and ~3 other exchanges.

Two variants selected via `:variant` config key:

**Bitfinex** (default): `/api/path + nonce + body` → HMAC-SHA384 → hex
**Gemini**: `base64(json(payload))` → HMAC-SHA384 → hex, payload in header

## Configuration

    signing: %{
      pattern: :hmac_sha384_payload,
      variant: :bitfinex,
      api_key_header: "bfx-apikey",
      signature_header: "bfx-signature",
      nonce_header: "bfx-nonce"
    }

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