So OnePage Checkout provides a simple and easy-to-use backend that any can use, configure it without coding knowledge. It can works well on any OpenCart themes.
Main Features
Hide unwanted checkout inputs
Input coupouns/vouchers directly at checkout
Guest or account creation, returning user on checkout
Included ocmod to switch all checkout links to module page
Automatic payment confirm for payment methods that don’t require additional input to speed up checkout
Compatible with most opencart payment/shipping modules
Compatible with all bootstrap 3 opencart themes including opencart default theme
Change Log
Version 1.1.6 for OC3: Updated on Dec 10, 2018 [Fix bugs] + Enabled/disabled some params not working + Disable javascript warning popup [Update] Updating address information billing, shipping when customers register account [Update] Optimized code
Updated on July 11, 2018 [Fixbug]
Version 1.1.4 for OC3 & 1.0.7 for OC2.3.x: Updated on Mar 21, 2018 [+] Update: Fix bug Customfield not working with customer group. + So_onepagecheckout_opencart.2.3.x-res_v1.0.7.ocmod.zip + So_onepagecheckout_opencart3.x-res_v1.1.4.ocmod.zip
Version 1.1.3 for OC3: Updated on Feb 27, 2018 [+] Update: fix bug version 1.1.3 for oc3
Version 1.1.0: Updated on August 27, 2017 [+] Update OpenCart 3
Version 1.0.2: Updated on May 17, 2017 [+] Fixed bug: not display Fix bug shipping method
Version 1.0.0: Released on March 24, 2017 - Initial release - Support OpenCart 2.3.x and 2.2.x