[zeus@xps13 ] /tmp$ lsb_release -a
No LSB modules are available.
Distributor ID:	Neon
Description:	KDE neon 5.27
Release:	22.04

[zeus@xps13 ] /tmp$ python3 -m venv venv
[zeus@xps13 ] /tmp$ source venv/bin/activate
(venv) [zeus@xps13 ] /tmp$ pip install easybill-rest
Collecting easybill-rest
(venv) [zeus@xps13 ] /tmp$ deactivate 
[zeus@xps13 ] /tmp$ rm -rf venv/
[zeus@xps13 ] /tmp$ python3 -m venv venv
[zeus@xps13 ] /tmp$ source venv/bin/activate
(venv) [zeus@xps13 ] /tmp$ pip install -U setuptools
Requirement already satisfied: setuptools in ./venv/lib/python3.10/site-packages (59.6.0)
Collecting setuptools
  Downloading setuptools-67.8.0-py3-none-any.whl (1.1 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.1/1.1 MB 4.8 MB/s eta 0:00:00
Installing collected packages: setuptools
  Attempting uninstall: setuptools
    Found existing installation: setuptools 59.6.0
    Uninstalling setuptools-59.6.0:
      Successfully uninstalled setuptools-59.6.0
Successfully installed setuptools-67.8.0

(venv) [zeus@xps13 ] /tmp$ pip install easybill-rest
Collecting easybill-rest
  Using cached easybill_rest-0.3.1.tar.gz (9.1 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      error in easybill_rest setup command: 'extras_require' must be a dictionary whose values are strings or lists of strings containing valid project/version requirement specifiers.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.