Do API methods exist in Gmail that can perform tasks like adding to favorites or marking as not spam?

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Yes, API methods exist in Gmail that can perform tasks like marking emails as favorites or marking them as not spam. The Gmail API allows developers to access and modify a user's mailbox, by providing a set of RESTful APIs that they can call to perform various actions such as creating, reading, updating, and deleting messages or labels, moving messages to a specific folder, marking emails as read or unread, adding or removing labels, setting an email as important or not important, and more. These API methods can be used to build custom applications, integrate with other apps or services, or automate email management tasks.