2 days ago · The USPS or the employees of the post office are allowed to make any package trackable. For this purpose, they assign a tracking number to almost all the packages they get from the USPS customer. This number that the USPS allots to its customers is called the USPS track number. This number is also known as the label number or the article number.
SP-API is the next generation suite of API-based automation functionality for Amazon's Selling Partners and is an evolution of Amazon Marketplace Web Service (Amazon MWS) APIs, which have been offering sellers programmatic access to critical Amazon features for more than 10 years.