choose the right oauth2 grant type for an infor ion api integration
domain: developer.infor.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Use the OAuth2 SAML Bearer Grant when the calling application is already SSO-authenticated inside Infor OS (portal apps, embedded apps) and can reuse its existing token
Use the Authorization Code Grant for native desktop/mobile apps or web apps where an interactive user logs in and consents
Use the Implicit Grant only for single-page/user-agent-based applications that can't securely hold a client secret
Use the Resource Owner Grant with a service account (saak/sask) for unattended, server-to-server backend integrations where no user is present
Confirm the app's security roles (e.g. IONAPI-Administrator, IONAPI-User) are assigned before testing the flow
Known gotchas
Picking Authorization Code or Implicit for a backend batch job fails because there's no user session to complete the interactive login step
Access tokens expire in roughly two hours regardless of grant type, so even service-account integrations must handle re-authentication, not just the initial login
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