Integrating Payment Processor

I’m planning to integrate a payment processor into my checkout Woocommerce plugin.

The platform I’m using accepts payments through bank cards. They provide the following lines of code for website integration (into their framework).

<div width="120px">
<form method="post" action="https://voguepay.com/pay/">
Enter Amount<br />
<input type="text" name="total" style="width:120px" /><br />
<input type="hidden" name="v_merchant_id" value="12347-5552" />
<input type="hidden" name="notify_url" value="" />
<input type="hidden" name="success_url" value="" />
<input type="hidden" name="fail_url" value="" />
<input type="hidden" name="memo" value="Payment to G Accessories" />
<input type="image" src="http://voguepay.com/images/buttons/make_payment_blue.png" alt="PAY" />
</form>
</div>

I inserted it in the ‘Edit Page’ text box for my Checkout page (under the [woocommerce_checkout] shortcode).

On testing, when I click on ‘Place Order’, the following error comes up (just the raw code shows up on the page):

{"result":"failure","messages":"

    \n\t\t\t
    Action failed. Please refresh the page and retry.<\/li>\n\t\t\t
    Sorry, your session has expired. Return to homepage →<\/a><\/li>\n\t\t\t
    First Name<\/strong> is a required field.<\/li>\n\t\t\t
    Last Name<\/strong> is a required field.<\/li>\n\t\t\t
    Address<\/strong> is a required field.<\/li>\n\t\t\t
    Town\/City<\/strong> is a required field.<\/li>\n\t\t\t
    Postcode\/Zip<\/strong> is a required field.<\/li>\n\t\t\t
    Country<\/strong> is a required field.<\/li>\n\t\t\t
    State\/County<\/strong> is a required field.<\/li>\n\t\t\t
    Email Address<\/strong> is a required field.<\/li>\n\t\t\t
    Phone<\/strong> is a required field.<\/li>\n\t<\/ul>","refresh":"false"}

How would you advise that I would integrate this payment option (which is the primary, maybe only one) that I plan to use, into Woocommerce.

Thanks a lot.

http://ww.wp.xz.cn/extend/plugins/woocommerce/