UPDATES
23rd Aug 2020 ver 1.1 - Updated JS file for deprecated function as per WordPress core's 5.5 version. 3rd July 2020 - ver 1.0.18 - Updated Mailerlite API. 28th Feb 2020 - ver 1.0.17 - Updated Getresponse API. 30th Jan 2020 - ver 1.0.16 - Basic Updates. 10th Aug 2019 - ver 1.0.15 - Default list option has been added. Now, if this list is set then all the product buyers' emails will go to this email list if any list is not selected at product level.Source