> ## 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

### apiKey

```kotlin theme={null}
val apiKey: ApiKey
```

### appIdentifier

```kotlin theme={null}
val appIdentifier: () -> String?
```

### baseUrl

```kotlin theme={null}
val baseUrl: String
```