PHP:如何在贝宝中添加信用卡方法选项

我一直在php中开发贝宝集成网关。我从谷歌上学习了一些教程。现在我想通过贝宝添加一些信用卡选项（签证，万事达卡等）。请指导我如何在php中添加此功能

这是一个简单的html表单

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
    <!-- Identify your business so that you can collect the payments. -->
    <input type="hidden" name="business" value="businesstest541@shop.com">
    <!-- Specify a Buy Now button. -->
    <input type="hidden" name="cmd" value="_xclick">
    <!-- Specify details about the item that buyers will purchase. -->
    <input type="hidden" name="item_name" value="Hot Sauce-12oz Bottle">
    <input type="hidden" name="amount" value="5.95">
    <input type="hidden" name="currency_code" value="USD">
    <!-- Display the payment button. -->
    <input type="image" name="submit" border="0"
           src="https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif"
           alt="PayPal - The safer, easier way to pay online">
    <img alt="" border="0" width="1" height="1"
         src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" >
    </form>