# Merx::currency()

> Currency of the pricing rule

- Source: `src/Merx.php#L242` <https://github.com/wagnerwagner/merx/blob/2.0.0-alpha.11/src/Merx.php#L242>

```php
Merx::currency(): string|null
```

## Return type

`string|null`

Three-letter ISO currency code, in uppercase. E.g. EUR or USD

## Parent class

`Wagnerwagner\Merx\Merx`