Simple 2checkout payment gateway form to integrate on your site

Sandbox URL  :  https://sandbox.2checkout.com/checkout/purchase
Live URL  : https://www.2checkout.com/checkout/purchase

<form method="post" action="https://www.2checkout.com/checkout/purchase" id="pay_checkout_now">
                                            <input type="hidden" value="202356803" name="sid">
                                            <input type="hidden" value="2CO" name="mode">
                                            <input type="hidden" value="N" name="li_0_tangible">
                                            <input type="hidden" value="product" name="li_0_type">
                                            <input type="hidden" value="1" name="li_0_quantity">
                                            <input type="hidden" value="Bill for order #5772" name="li_0_name" id="twocheck_item_name">
                                            <input type="hidden" value="56.00" name="li_0_price" id="twocheck_amount">
                                            <input type="hidden" value="5772" name="li_0_product_id" id="twocheck_item_number">
                                            <input type="hidden" value="return url of your website" name="x_receipt_link_url" id="twocheck_return">
                                            <input type="submit" value="Pay with 2Checkout" class="coloredbtn_inq pay2cc_inq" name="submit_twocheck" id="paycheckout">
                                         </form>

Read more about here https://www.2checkout.com/developers