ApiOpenStudio allows you to store variables in two places:
Navigate to Vars in the main menu:
This page only deals with Permanent variables.
Click on the plus icon:
A modal will appear:
Variables are associated with an Account/Application, so the name only needs to be unique to that application.
Select the Account and Application from the dropdown fields.
The Key is the name of the variable.
The Value field is the value of the vaiable.
Click on the edit icon (pencil) to edit the variable:
A modal will appear, allowing you to alter the value of the variable.
Click on the delete icon (trashcan) to delete the variable:
A pop up will appear, asking for confirmation that you want to delete the variable: