# `AttestoPhoenix.PARStore`
[🔗](https://github.com/XukuLLC/attesto_phoenix/blob/v0.19.0/lib/attesto_phoenix/par_store.ex#L1)

Behaviour for Pushed Authorization Request storage (RFC 9126).

The store keeps normalized authorization request parameters behind a PAR
`request_uri` reference. Values are opaque maps because the authorization
endpoint still runs the normal `Attesto.AuthorizationRequest` validation after
the reference is resolved.

The authorization endpoint uses `fetch/1`, not `take/1`, because host
applications commonly establish login or consent and then re-enter the
authorization endpoint with the same `request_uri`. Stores should expire
entries by TTL; they should not consume them simply because the front channel
was resolved.

# `fetch`

```elixir
@callback fetch(String.t()) :: {:ok, map()} | :error
```

# `put`

```elixir
@callback put(String.t(), map(), pos_integer()) :: :ok | {:error, term()}
```

# `take`
*optional* 

```elixir
@callback take(String.t()) :: {:ok, map()} | :error
```

---

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