# `Money.ExchangeRates.Callback`
[🔗](https://github.com/kipcole9/money/blob/v6.0.0-rc.0/lib/money/exchange_rates/callback_module.ex#L1)

Default exchange rates retrieval callback module.

When exchange rates are successfully retrieved, the function
`latest_rates_retrieved/2` or `historic_rates_retrieved/2` is
called to perform any desired serialization or proocessing.

# `historic_rates_retrieved`

```elixir
@callback historic_rates_retrieved(%{}, Date.t()) :: :ok
```

Defines the behaviour to retrieve historic exchange rates from an external
data source.

# `latest_rates_retrieved`

```elixir
@callback latest_rates_retrieved(%{}, DateTime.t()) :: :ok
```

Defines the behaviour to retrieve the latest exchange rates from an external
data source.

# `historic_rates_retrieved`

```elixir
@spec historic_rates_retrieved(%{}, Date.t()) :: :ok
```

Callback function invoked when historic exchange rates are retrieved.

# `latest_rates_retrieved`

```elixir
@spec latest_rates_retrieved(%{}, DateTime.t()) :: :ok
```

Callback function invoked when the latest exchange rates are retrieved.

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