Custom API / Wordpress Plugin - Fix & Regular Maintenance

We have a custom plugin which connects to the Webex API in order to display our online classes and allow students to register for them (integrated with woocommerce). Recently the plugin stopped working (when we updated woocommerce plugins), and as our developer disappeared, we are looking for someone with the skills to fix the issue, and to be our go-to developer for future upgrades and fixes. Must have experience working with custom wordpress plugins and API's, please mention that information in the bid. Kind regards, Ari PROJECT DETAILS The custom plugin displays the current course dates from our Webex account via API, so that they display on our website. Here is one of the pages that displays course dates for registration: [login to view URL] (drop down menu on the right where it says "Select Course Dates" that is not currently showing dates - [login to view URL]). Then users could then register/pay (via woocommerce) for their chosen course, and their information was sent back to webex via API so that they are registered for that course in webex. Webex then sends them a confirmation email with a link to log into their class. The plugin for this has already been created, but when we recently updates the woocommerce plugins, the custom plugin stopped working (course dates no longer display on the website, and can no longer complete checkout via woocommerce), and as our previous developer disapeared, are now looking for someone who can fix this, as well as develop new features in the future / update the pluguin with wordpress updates etc. Here is a folder with a copy of the custom plugin files: [login to view URL] REFERENCE MATERIALS Here is our list of courses on webex (we don't use this page for anything, just so you can see the courses that are being imported to the website): [login to view URL] Here is the Webex API documentation: [login to view URL] Please review the materials and feel free to ask any questions to see if you can fix the immediate issue, and work on future maintenance and feature development.