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As newtonsoft-json is used for internal logic, you need to install the json package yourself.
https://kakaogames.atlassian.net/wiki/spaces/KS3GFC/pages/413468804/1.1.+Unity+SDK 설치 | 1+Installation#1.1.3.149.-Newtonsoft.Json 패키지 설치-Installation-(SDK-3.15.0 이상-or-later)
The Facebook SDK has been updated, so adding the Facebook Client Token has been changed to be mandatory.
https://kakaogames.atlassian.net/wiki/spaces/KS3GFC/pages/413632605/2.1 페이스북 | 2+Facebook#2.1.2. 페이스북 개발자 센터(클라이언트 토큰 확인) SDK -Facebook-Developer-Center-(Client-Token-Settings)---SDK-3.15.0 이상 버전 적용 시 설정 필요-or-later-versions-require-setting
It has been added so that you can set the Facebook Client Token in the Editor.
https://kakaogames.atlassian.net/wiki/spaces/KS3GFC/pages/413468804/1.1.+Unity+SDK 설치 | 1+Installation#1.1.3.10. 페이스북 정보 설정7.-Facebook-information-setting
Upgrading the Unity SDK to 3.14.6
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