Features for the Customers:

• View and update the cart items quantity on the Checkout page.
  Newsletter subscription from the checkout page.
  Customers can checkout as guest users.
  Create an account from the One Page Checkout page
  Easy to log in using social media accounts.
  Complete the order from a single page.
  Customers can select desired shipping and payment method on the checkout page itself.

The OpenCart One Page Checkout Extension by Knowband removes the default multi-step checkout from the OpenCart store and offers an interface through which customer can complete their orders from the single page which improves the customer experience and reduces the cart abandonments on your store and also helps you to increase sales.

Compatibility
3.0.0.0, 3.0.1.1, 3.0.1.2, 3.0.2.0, 3.0.3.0, 3.0.3.1, 3.0.3.2, 3.0.3.3, 3.0.3.5, 3.0.3.6, 3.0.3.7, 1.5.4, 1.5.4.1, 1.5.5.1, 1.5.6, 1.5.6.1, 1.5.6.2, 1.5.6.3, 1.5.6.4, 3.0.3.7, 2.0.0.0, 2.0.1.0, 2.0.1.1, 2.0.2.0, 2.0.3.1, 2.1.0.1, 2.1.0.2, 2.2.0.0, 2.3.0.0, 2.3.0.1, 2.3.0.2