The International Olympic Committee has recently approved the official qualification system for karate events at the 2020 Tokyo Summer Olympic Games. You may read this document at the following link: 
https://wkf.net/pdf/olympic/Tokyo2020-QualificationSystem.pdf 

In addition, the World Karate Federation has recently shared the following additional and related documents with its member National Federations:

• A description of the qualification process
  (click here to view the document)
• A flow chart of the qualification process
  (click here to view the document)
• An updated version of the WKF Ranking Rules, which contains detailed information about the regulation of the “Tokyo 2020 Olympic Standing”
  (WRC_Ranking Regulations_05122017).