> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuration

> Kotlin Data Class

**Data Class**

```kotlin theme={null}
data class Configuration(val apiKey: ApiKey, val appIdentifier: () -> String?)
```

## Constructors

```kotlin theme={null}
constructor(apiKey: ApiKey, appIdentifier: () -> String?)
```

## Properties

| Property        | Type            | Description |
| --------------- | --------------- | ----------- |
| `apiKey`        | `ApiKey`        | -           |
| `appIdentifier` | `() -> String?` | -           |
| `baseUrl`       | `String`        | -           |