> For the complete documentation index, see [llms.txt](https://docs.vpay.africa/vpay-js-inline-dropin-integration-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vpay.africa/vpay-js-inline-dropin-integration-guide/3.-web-app-setup.md). # 3. Web App Setup This section details the setup of the VPay JS Payment Dropin for desktop and mobile responsive web apps. All examples are made with reference to the SANDBOX environment. With a few lines of code, you can integrate the VPay Javascript Dropin library and start accepting payments on your web and mobile web sites. The library is available at: *Sandbox Base URL:* [*https://dropin-sandbox.vpay.africa*](https://dropin-sandbox.vpay.africa) *Live Base URL:* [*https://dropin.vpay.africa*](https://dropin.vpay.africa) ### HTML Code Snippet (For Sandbox) ```html Order Checkout Page ``` {% hint style="warning" %} Each transactionref that you generate should be unique, alphanumeric and different from previously used ones. You may generate a ref using any scheme of your preference. {% endhint %} {% hint style="warning" %} When setting up for your live web app, remember to edit the **head** \