Support more OpenCart version - OpenCart 1.4.9 to OpenCart 1.5.1.3.1
Support VQMod.No OpenCart Core Files Replace.
Support Shoppica theme.
Support coupon and gift voucher,reward pionts.
Front office demo: http://www.backonoc.com/demo/oc1.5.1.1/
Back office demo:http://www.backonoc.com/demo/oc1.5.1.1/admin
demo/demo
Shoppica theme demo:
http://www.backonoc.com/
1.4.9.x demo: http://www.backonoc.com/demo/oc1.4.9.6/
Just in case,another 2 demo:
http://www.backonoc.com/demo/oc1.5.1.2/
http://www.backonoc.com/demo/oc1.5.1.3/

Extension also can be bought here:
http://www.opencart.com/index.php?route ... on_id=3922
Key Features:Support all opencart shipping method,payment method,feel free to test it!
1, One Page --- Retrieve all customer data on one page (Payment, Address, E-mail, etc.)
2, No Data Loss --- After install you still have all settings and products!
3, No Back end Changes --- Everything that you would normally change in the back-end will have the same affect. (shipping rates, Payment Method etc.)
4, Increase Sales --- Study's have shown that one page checkouts increase conversion up to 70%
Award Winning Checkout Experience
Our professionally designed one page checkout features high user friendly interface. Where the customer can enter in all required info on just one page!
Satisfied Customers
The quality of your products and services is not the only deciding factor for sales. A fast secure transaction checkout process is absolutely necessary to bring to an end of over 45% of abandoned carts and increase sales!
Less Time Consuming
Our one page checkout gives your customers a single platform where they provide all information, including billing, shipping and credit card details. This encourages them to finish the process as well as saves time. Your customers will no longer need to submit information and than wait for next web page to open in your browser.
AJAX
Our one page checkout uses advanced AJAX (Asynchronous Javascript And XML) technology to communicate with your server during the checkout. Even slower server will benefit from our AJAX technology as it allows customer to remain and wait until the whole checkout page is loaded.
More Conversion
Multi-page checkout annoy users enough to leave your store. You are here to make sales and having checkout that is fast and easy will ensure people actually buy the products.
install instructions is included in the package
Any questions,feel free to contact me.
yuyamu@hotmail.com
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Notes:
v1.9.2&v2.9.2(02/02/2011)
-Improve payment method view that extra field or information is needed(matches OpenCart original checkout view,so there is no need to modify other payment method files)
v1.9.1&v2.9.1(31/01/2011)
-Improve source code display.(matches OpenCart Original source code so vqmod can find the code,NOT important if there is no conflict with other extension)
v1.9&v2.9(18/01/2011)
-Fix small bug:shipping method error if not shipped to country.
v1.8&v2.8(14/01/2011)
-(v1.

-Improve css view.
v1.7&v2.7(09/01/2011) - If you did not use shoppica theme,you can ignore this update.
-Fix shoppica bug:shoppica cart popup isnt refresh when user log in on onepagecheckout, there might be some products from previous session to show.
v1.6&v2.6(07/01/2011)
-Another greatest update.Improve to set admin setting panel in the back office,NO need to manual modify any files any more!
-Fix ideal bank not show bug.
v1.5v2.5(29/12/2011)
--Fix bugs that do not auto update login and shopping cart.
v1.4&v2.4(27/12/2011)
-Greatest update to separate URL,support more opencart version,support VQmod,support shoppica theme.
v1.3&v2.3(11/12/2011)
-Improve to support coupon and gift voucher.
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v1.2/v2.2(01/12/2011)
-Fix bugs:If the only item in shopping cart doesn't need shipping , and login using the form in the checkout page, then get an error with tax and stuff).
-Improve to support more shipping method.
-Improve view.
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v1.1/v2.1(16/11/2011)
-Improve payment method parts,support all opencart payment modules,also support multi payment fee.
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v1.0/v2.0 (11/11/2011)
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- Initial release