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

# ExchangeAuthCodeForAPIKeyCodeChallengeMethod

The method used to generate the code challenge

## Example Usage

```python theme={null}
from openrouter.operations import ExchangeAuthCodeForAPIKeyCodeChallengeMethod

# Open enum: unrecognized values are captured as UnrecognizedStr
value: ExchangeAuthCodeForAPIKeyCodeChallengeMethod = "S256"
```

## Values

This is an open enum. Unrecognized values will not fail type checks.

* `"S256"`
* `"plain"`