# Installation ## 1. Add Your API Key Meta Tag Add the following meta tag to the `` of your HTML file. This is **required** for the SDK to authenticate with the play.fun API. The value is your **creator API key** from the play.fun developer dashboard. ```html ``` ## 2. Add the SDK Script Add the following script tag to your HTML file, after the meta tag: ```html ``` This loads the `OpenGameSDK` into the global window. ## Full Example ```html ``` {% hint style="warning" %} The `x-ogp-key` meta tag must be present in your HTML `` before the SDK initializes. Without it, all API calls will fail with authentication errors. You can alternatively pass the key as `apiKey` in the SDK constructor, but the meta tag approach is recommended. {% endhint %}