# `DripDrop.Policy.RateLimit.Backend`
[🔗](https://github.com/agoodway/dripdrop/blob/v0.1.0/lib/dripdrop/policy/rate_limit/backend.ex#L1)

Behaviour for rate-limit backends used by the messaging policy gate.

# `check`

```elixir
@callback check(map(), map()) :: :ok | {:defer, DateTime.t(), map()} | {:error, term()}
```

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