Once this addon has been added and activated you should go to MEC Settings > Bookings > Payment Gateway and make sure that the newly added option Add to WooCommerce Cart is activated.
Make sure to read this post on how to translate: https://webnus.net/dox/modern-events-calendar/translate-mec
No, WooCommerce Payment Gateway utilizes the booking feature which is exclusive to MEC Pro and not available in MEC Lite.
Navigate to the addon’s setting through MEC Settings > Booking > Payment Gateways and enable the “Sync WooCommerce Order Status with MEC Booking Status” option. For more info please read the document below:
Let me know if you have any other questions in the comment area.