Create an application
Register an application to receive a Client ID and Client Secret. Use them with the token endpoint to obtain access tokens for the API. Apps you already have are under Your apps.
Sign in with your Tax Star developer account to create an application.
Signed in with a reseller account? Your app reaches the reseller endpoints only — pre-registering and listing your clients and reading their counts — not users, entities or invoices. Has Tax Star given your existing account reseller access? Then your apps keep the full API and can call the reseller endpoints too. Any other app is a partner app as well: it can pre-register its own clients under Partner overview. See Reseller accounts.