...

1. Otapiphpclient library (https://github.com/OTCommerce/otapiphpclient.git). Already available installation archive of the module with all dependencies for php 7.4.
2. PHP 7.4 for OpenCart3.
3. To automatically update products on a schedule: scheduler (cron). 
4. MySQL DBMSDatabase.

Installation

Before plugin installation it is strongly recommended to create backup copy of website and database files.

...