Skip to main content
PrerequisitesBefore testing with Postman, set up an integration and link an account following the Getting Started guide.

​
Get the collection

The StackOne public Postman workspace has a pre-configured collection for the Unified APIs (HRIS, ATS, CRM, and more). Fork it into your own workspace to get started: Run in Postman The collection has Basic Auth configured with {{apiKey}} as the username, and an x-account-id header set to {{accountId}}.

​
Set up your environment

1

Create an environment

In Postman, click the Environments icon in the left sidebar, then + to create a new environment. Name it “StackOne” (or similar).
2

Add your credentials

Add these variables to the environment:
VariableValue
apiKeyYour StackOne API key — find it in the dashboard under Settings → API Keys
accountIdThe linked account ID you want to target — visible in the Accounts page
3

Select the environment

Select your environment from the dropdown in the top-right corner of Postman before sending any request.

​
Make a request

With your environment active, open any request in the collection and click Send. The {{apiKey}} and {{accountId}} variables are resolved automatically from your environment.
Start with GET /accounts to confirm your API key is working — it returns all linked accounts for your project.

​
Troubleshooting

{"error":"Invalid authentication token"} — Your apiKey variable is missing or incorrect. Check that the right environment is selected and the value matches your key from the dashboard.