Here is our latest issue
The cSelling Partner API (SP-API) is a modernized suite of REST APIs utilizing standards that today's developers expect, while making it as simple as possible to migrate from our legacy Amazon Marketplace Web Service (Amazon MWS) APIs.
As there were many missing guidelines on this matter, Amazon issued this update, clarifying everything. We recommend all sellers to review this update, and update your email templates, accordingly.
The new policy impacts sellers who ship their own orders, as opposed to using Fulfillment by Amazon (FBA).