> ## Documentation Index > Fetch the complete documentation index at: https://docs.orchard.africa/llms.txt > Use this file to discover all available pages before exploring further. # Add Orchard investments with a CDN script tag and button > Load the Orchard SDK from the CDN with one script tag, create a session, and open the investment flow from a button with success, close, and error callbacks. The CDN script is the quickest way to add Orchard to any website. You load `orchard.js` with a script tag, create a session with your API key, and open the investment flow when a user clicks a button. No package manager or build step is required. Add the Orchard script to your page. It exposes the `window.OrchardSDK` constructor. ```javascript theme={null} ``` Request a session token, create an `OrchardSDK` instance, and call `open()` with your callbacks. ```javascript index.html expandable theme={null} ``` Add the element users click to start investing. The example below listens on an element with the ID `invest`. ```html theme={null} ``` ## Configuration Your Orchard public key, starting with `pk_`. The Orchard embed API URL, for example `https://core.orchard.africa/api/v1/embed`. The token returned in `data.token` from `POST {apiUrl}/session`. ## Callbacks Pass these to `orchard.open()`: | Callback | When it runs | | - | - | | `onSuccess(investment)` | The user completes an investment. Receives the investment details. | | `onClose()` | The user closes the flow. | | `onError(error)` | The investment fails. Receives the error. | Wrap `init()` in a `.catch()` as shown so that a failed session request is logged instead of failing silently. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.