libcups v3.0b2 is the second beta release of the CUPS v3 library and tools which remove deprecated APIs, add new APIs, and normalize existing APIs. Changes include:

• Added the ipptransform command to replace/upgrade the ippevepcl and
  ippeveps commands (Issue #65)
• Added cupsFormDecode and cupsFormEncode APIs (Issue #49)
• Added cupsJWT APIs to support JSON Web Tokens (Issue #50, Issue #52)
• Added ippAddCredentialsString and ippCopyCredentialsString APIs
  (Issue #58)
• Added cupsCreateCredentialsRequest and cupsSignCredentialsRequest APIs and
  updated cupsCreateCredentials API to better support X.509 certificates
  (Issue #59)
• Updated the configure script to add _FORTIFY_SOURCE=3 (previous level was 2)
  when not using address sanitizer and when it hasn't already been added
  (Issue #51)
• Updated the httpAddrListen function to use the maximum backlog value.
• Fixed ipptool limit on the size of an attribute value that would be printed
  (Issue #5)
• Fixed some configure script issues (Issue #48)
• Fixed JSON output bug in ipptool.
• Fixed CUPS_DNSSD_IF_INDEX_LOCAL when using Avahi.

Enjoy!