Guide
Create a dataset
Keep the values your tests reuse in one place, not scattered through them
Steps
Open Data under Data Management
The line under the heading is the one that matters: reference a variable in a test with double-brace syntax. Change the value here and every test using it picks up the new value on its next run — you don't touch the tests at all.
Name the dataset for what it is
Group by purpose rather than by person where you can. A dataset called "Branch Caller Details" survives a change of test data; one called after a single person tends not to.
Add your first item
Copy the usage snippet
Use lowercase with underscores. The snippet is generated from whatever you type, so a key with a space or a capital produces a reference that is awkward to use later.
Pick the right type
Watch a secret mask itself
Masking is about shoulder-surfing and screenshots, not encryption. Treat a secret as hidden from view, not as a vault.
Create it