# `PhoenixKitCatalogue.Pro100.Id`
[🔗](https://github.com/BeamLabEU/phoenix_kit_catalogue/blob/v0.19.1/lib/phoenix_kit_catalogue/pro100/id.ex#L1)

PRO100 numeric id: the SKU reduced to digits only (`"76.0026.12"` ->
`"76002612"`). Shared by the PRO100 export (id column) and import (match key)
so the two never drift. `nil`/no-digit -> `""`.

# `digits_only`

```elixir
@spec digits_only(String.t() | nil) :: String.t()
```

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