Submit a form according to the choice of the button radio
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I am building an ecommerce web application for School Education.
The customer have choice between three payment methods. Let's Say Paypal, Monebookers(Skrill) and Alerpay. That means : each product must have three " Buy Now " Buttons.Here are exemple of these button : 
    

PAYPAL

    <form action="https://www.paypal.com">
    <input type="hidden" name="business" value="payment@mail.com">
    <input name="submit" >
    </form>



ALERTPAY

    <form action="https://www.alertpay.com">
    <input type="hidden" name="business" value="payment@mail.com">
    <input name="submit" >
    </form>



MONEYBOOKERS

     <form action="https://www.moneybookers.com">
     <input type="hidden" name="business" value="payment@mail.com">
     <input name="submit" >
     </form>


My purpose is to just have one "Buy Now" button in front of each product.

After clicking that button, the customer is redirected to a page where he will have to choose one payment method by selecting it with the radio button.

After his selection, he will submit his choice by click on a button and according to his choise, he will land to paypal or alertpay or moneybookers website.

I am a novice in php and I know this is possible, but I don't just know how to do it.
Any help would be greatly appreciated