Wekan provides a python script to ease the call of the REST API from command line interface.
You need python3.
Windows
choco install python3
# REBOOT
pip3 install pip --upgrade
pip3 install json
python3 wekan.py
Debian/Ubuntu
sudo apt-get -y install python3 python3-pip python3-simplejson
sudo pip3 install pip --upgrade
chmod +x wekan.py
./wekan.py
Copy the api.py script to you machine. Newest Wekan Python CLI api.py here.
Then, in this script, look for and change:
Keep in mind your Wekan credentials are potentially accessible in this file.
Then call it without any argument to see if everything is all right. You should just get usage examples.