Hello @mad-ascent
Thank you for getting in touch with us!
Actually, the CartFlows does not provides any direct integration with such plugins.
But the CartFlows is dependant on the WooCommerce and creating a order in the WooCommerce with the help of same checkout fields that are of the WooCommerce.
So, to help you with this more if you integrate that plugin with the WooCommerce then it will also work with the CartFlows.
For example, if the order is placed from the CartFlows page then the CartFlows will create a new order in the WooCommerce. Now as soon as the WooCommerce gets the new order it should notify the MailerLite Plugin and that plugin will send all the order tails to your list which is associated to the current order ID.
Also, can you please check that is it working with the default WooCommerce’s checkout page too.
I hope this clarifies you.
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Please let me know in case you have more questions.