If You want to find modules, which will be as compatible with the version of the online store, and also pay attention to the quality of the code, then we offer to view: cron jobs, this solution was specifically designed for stores, working on the platform OpenCart, with the support of our company from every store that works on CMS Brocart.
When you download a free extension, we do not give 100% guarantee that it will work in your store, please be careful about the installation instructions!
They were added to Opencart 3.1 but missing for older versions, so we've made this into a module that can be easily installed and backwards compatible.
View more details in the documentation: http://docs.opencart.com/extension/cron/
This extension works very well with our email extensions: