How to trigger the cart abandonment events using Google Analytics & Acoustic Exchange?

I have followed this documentation to try and integrate Google Analytics & Acoustic:

• https://help.goacoustic.com/hc/en-us/articles/360042822034-Integrate-Acoustic-Exchange-and-Google-Analytics
• https://help.goacoustic.com/hc/en-us/articles/360042922674-Integrate-Exchange-and-Google-Analytics-with-Google-Tag-Manager
• https://developer.goacoustic.com/acoustic-campaign/docs/shopping-cart-activity#acoustic-campaign-configuration

I have successfully created an Exchange Endpoint with Google Analytics and have subscribed to these events:

• ibmcartAbandonment
• ibmcartAbandonmentItem
• ibmcartPurchase
• ibmcartPurchaseItem
• ibmproductView
• ibmBrowseAbandonment
• ibmBrowseAbandonmentItem

However, I am unsure how to go about actually triggering these?

How do I get Google Analytics and/or Google Tag Manager to trigger the `ibmcartAbandonment` event?

The documentation is very vague about this.

Thanks