# Code your Kotlin project using the SDK for Kotlin
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Now the fun begins. As you develop your application, you can refer to the [AWS SDK for Kotlin API Reference](https://docs.aws.amazon.com/sdk-for-kotlin/api/latest/index.html) for complete information on the API operations. Use the following links for general Kotlin API information:
+ [Standard library API reference](https://kotlinlang.org/api/latest/jvm/stdlib/)
+ [Coroutines overview](https://kotlinlang.org/docs/coroutines-overview.html)
+ [Coroutines API](https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/)

## Log in using the AWS CLI
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Whenever you run a program that accesses AWS services, you need an active AWS access portal session. You do this by running the following command.

```
aws sso login
```

Since you have a default profile setup, you do not need to call the command with a `--profile` option. If your IAM Identity Center single sign-on configuration uses a named profile, the command is `aws sso login --profile named-profile`.

To test if you already have an active session, run the following AWS CLI command.

```
aws sts get-caller-identity
```

The response to this command should report the IAM Identity Center account and permission set configured in the shared `config` file.