# `CCXT.WS.Auth.InlineSubscribe`
[🔗](https://github.com/ZenHive/ccxt_client/blob/main/lib/ccxt/ws/auth/inline_subscribe.ex#L1)

Inline Subscribe auth pattern — coinbaseexchange.

Auth data is attached to each private subscribe frame rather than sent
as a standalone auth message. `build_auth_message/3` therefore returns
`:no_message`; the per-subscribe fields come from `build_subscribe_auth/4`.

## Payload Format (matches CCXT's `coinbaseexchange.authenticate()`)

    timestamp_seconds <> "GET" <> "/users/self/verify"

The secret is base64-decoded before HMAC-SHA256 and the signature is
base64-encoded. `credentials.password` (passphrase) is included when set.

## Example Subscribe with Auth (coinbase)

    %{
      "type" => "subscribe",
      "product_ids" => ["BTC-USD"],
      "channels" => ["level2"],
      "key" => "api_key_here",
      "timestamp" => "1699999999",
      "signature" => "base64_signature",
      "passphrase" => "my_passphrase"
    }

---

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