Masternodes are custom nodes representing a reusable sub-workflow.
- Define all the possible actions towards an API
- Re-use a combinaison of action in your workflows
- Pre-counfigure and simplify use of nodes for your team
Once created, your master nodes will be available in the corresponding list in the workflow editor
Find more informations on how to create a masternode here
If you're not seeing one master node, this one is proably not valid!