According to the AP website, “The AP Stylebook is the definitive guide to writing, reporting and editing news. It is an independent product of the Associated Press and has been published since 1895.
” The website also states that “The Stylebook offers clear, concise advice on how to write clearly and effectively. It covers grammar, punctuation, usage, style, abbreviation and other aspects of journalistic style.”.
When it comes to newsletters, there is no definitive answer as to whether or not the AP has one. However, given that the Stylebook is an authoritative source on journalistic style, it would make sense that the AP would offer guidance on how to create a newsletter.
In addition, given that a newsletter can serve as a way for journalists to share tips and advice with one another, it seems likely that the AP would offer a newsletter as part of its online resources.