> ## Documentation Index > Fetch the complete documentation index at: https://docs.alignet.com/llms.txt > Use this file to discover all available pages before exploring further. # Modal integration > Load the VPOS-2 JavaScript, prepare the form, and open the Modal. The payment request is sent by **HTTPS POST** from an HTML form. Always use the URL for the correct environment. | Environment | Modal JavaScript | | ----------- | -------------------------------------------------------------- | | Integration | `https://integracion.alignetsac.com/VPOS2/js/modalcomercio.js` | | Production | `https://vpayment.verifika.com/VPOS2/js/modalcomercio.js` | ## Basic implementation Include the environment JavaScript inside `head`. Add `class="alignet-form-vpos2"`, the POST method, and all required fields, including the `purchaseVerification` signature. Call `AlignetVPOS2.openModal()` from the user's click. ```html theme={"system"} ``` ## Safari consideration Safari may block the helper window required to enable gateway cookies if the Modal is opened from `setTimeout`, `onload`, or after an Ajax call. Open the Modal directly from a user action such as `onclick` or a link. If your flow needs a prior asynchronous operation, coordinate the documented Safari alternative with the Integrations team. Do not mix integration and production URLs in the same implementation. [Continue to parameters and responses →](/en/vpos-2/modal/parameters-and-responses)