Changelog

Added four fields (adultFlag, subTitle, previewMessage, extra) to the Alimtalk template lookup, register, and update specifications, and added a template review guide.

Added channel authentication token requests and token-based sender profile registration and lookup APIs to Kakao Biz Message Common.

Added the phone-number-list based audience estimate API (friend/possible) to Brand Message, and regrouped the audience estimate, channel friend count, and estimated duration lookups under "Pre-send checks".

Documented the broadcast send considerations (template specifications, operating hours, and friend group conditions).

Synced the API parameter specifications for every channel against the source code and officially published the reservation send guides for each channel (SMS, Kakao, RCS, and international).

Standardized the Sandbox base URL on sandbox-mars.ibapi.kr.

Improved the API reference field descriptions and UI, and removed the templateCode field from the Brand Message template registration and update APIs.

Added reservation registration along with APIs to look up, update, cancel, pause, and resume reservations and manage their recipients.

Added the MO (verification/voting) API reference and lookups for recently changed Alimtalk and Brand Message templates.

Opened the new developer center.