Thanks all who’ve posted in this thread. It’s been helpful. I would like to add that the $template_name param in ::sendEmail() should be set to the actual template name, and NOT the template slug. I was stuck on this for a bit because in the Mandrill template interface, the subtext below the Template Slug field says that the slug name is what is used for API calls. However, this is not the case for the WP plugin — it’s the Template Name that is used.
