I have a template named "Basic" that has two versions, different from each other - a draft one and the published one. Is there a way - through Mandrill API - to send the draft version, not the published one - or just in general to choose which version of the two to send?
If you haven't published the template before, when you use the send-template api call, the draft version should be sent. The draft vs. published option is generally to allow editing an already-published template in the application without affecting what's being sent via the API. If you have already published the template, and also have a draft, then in the web interface in the test menu is an option to send a test, which should allow you to send a test of the draft version instead of the published version.