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Google Checkout (Buy Now Button Code)
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<form method="POST" action="https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/1234567890" accept-charset="utf-8">

  <input type="hidden" name="item_name_1" value="Peanut Butter"/>
  <input type="hidden" name="item_description_1" value="Chunky peanut butter."/>
  <input type="hidden" name="item_quantity_1" value="1"/>
  <input type="hidden" name="item_price_1" value="3.99"/>
  <input type="hidden" name="item_currency_1" value="USD"/>

  <input type="hidden" name="ship_method_name_1" value="UPS Ground"/>
  <input type="hidden" name="ship_method_price_1" value="10.99"/>
  <input type="hidden" name="ship_method_currency_1" value="USD"/>
<form method="POST" action="https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/1234567890" accept-charset="utf-8">

  <input type="hidden" name="item_name_1" value="Peanut Butter"/>
  <input type="hidden" name="item_description_1" value="Chunky peanut butter."/>
  <input type="hidden" name="item_quantity_1" value="1"/>
  <input type="hidden" name="item_price_1" value="3.99"/>
  <input type="hidden" name="item_currency_1" value="USD"/>

  <input type="hidden" name="ship_method_name_1" value="UPS Ground"/>
  <input type="hidden" name="ship_method_price_1" value="10.99"/>
  <input type="hidden" name="ship_method_currency_1" value="USD"/>

  <input type="hidden" name="tax_rate" value="0.0875"/>
  <input type="hidden" name="tax_us_state" value="NY"/>

  <input type="hidden" name="_charset_"/>

  <input type="image" name="Google Checkout" alt="Fast checkout through Google"
src="http://checkout.google.com/buttons/checkout.gif?merchant_id=1234567890&w=180&h=46&style=white&variant=text&loc=en_US"
height="46" width="180"/>

</form>
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Google Checkout (Shopping Cart CSS)
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  .product-image { border:solid 1px #ccc; }
  .product-title, .product-price, .product-shipping { font-weight:bold; }
  .data-cell { padding:0px 50px 0px 10px;border:solid 0px #fff;vertical-align:top}
  .align-cart { padding-left:480px }
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Google Checkout (Shopping Cart HTML)
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<div id="googlecart-widget" class="align-cart"></div>
<table>
  <tr class="product">
    <td><img class="product-image" 
      src="http://code.google.com/apis/checkout/developer/files/google_tshirt.jpg"/>
    </td>
    <td class="data-cell">
      <div class="product-title">Google T-Shirt</div>
      <div class="product-price">Price: $12.99</div>
      <div class="product-shipping">Shipping: $4.99</div><br/>
      <div role="button" alt="Add to cart" tabindex="0" class="googlecart-add-button">
      </div>
    </td>
  </tr>
</table>