If you're building for our Classic Plugins, the data bank is slightly different.

Paths Workspace Data Bank

In Paths Workspace, you can use all of the Questions you have configured upstream of this HTTP Request + any User Attributes you have configured as variables

All of the variables that come from Paths Questions will be auto-populated in the Input Variables tab as a quick reference.

Queries Workspace Data Bank

In Queries Workspace, you can use the query keyword + any User Attributes you have configured as variables.

All of the variables that come from the query keyword will be auto-populated in the Input Variables tab as a quick reference.