Authorization code

Hello! How the authorization code is generated in the Standard Flow Enabled method? Why the 3rd part of the code remains unchanged, which means each of the three parts included in the code?
for example:code=9c9b4492-49cf-4a30-a38f-f889cd8e598d.072cba87-9f18-43ef-b252-149f7e785c93.7edfdc66-4705-4635-894c-315c62784b41