Overview

Tokens, sessions, and licenses in ERP.net are related but not the same thing.

An access token only represents authorization - proof that a user or application has the right to call an API.

A session, on the other hand, represents an active connection between ERP.net and that user or app.

Each session consumes a license slot while active.

Understanding how these three elements interact helps ensure your integrations are efficient, compliant, and predictable.

Key Concepts

Concept	Description
Access Token	A signed credential proving that the caller (user or app) is authorized. Obtaining a token does not reserve a license.
Session	Created automatically on the first API request using a valid token. Each session represents an active logical connection to the ERP.net server.
License Slot	A limited resource consumed by an open session. Each session occupies exactly one license slot. When the session closes, the slot is released.

Typical Lifecycle

1. App obtains an access token from ERP.net Identity Server.
   No license or session is created yet.
2. First API call using the token.
   ERP.net opens a session and reserves a license slot.
3. Subsequent API calls reuse the same session.
   Session lifetime is extended automatically.
4. Inactivity or explicit logout closes the session.
   License slot is released.

Note

You can hold multiple valid access tokens without consuming any licenses,
until one of them is actually used to access ERP.net data.

Session Expiration Basics

A session has two independent expiration timers:

• Sliding Expiration: 20 minutes of inactivity.
  Each API request refreshes this timer. If no requests occur within 20 minutes, the session is closed.
• Absolute Expiration: Applies only to background or service sessions (Client Credentials flow).
  The session ends automatically after 1 hour, even if continuously active.

These timers control session lifetime, not token validity.

Note

A valid token does not guarantee an active session.
If the session has expired, the next API request will attempt to open a new one.

Summary

• Access tokens authorize - sessions consume licenses.
• A token can be used only within the same ERP.net instance where it was issued.
• Sessions automatically close after inactivity or absolute expiration.
• Revoking a token does not immediately free a license - only closing the session does.

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Learn More

• Tokens and Sessions Relationship
  Understand how ERP.net links API calls, tokens, and sessions.

• License Slot Usage
  Learn how sessions consume and release license slots.

• Session Revocation and Logout
  See how sessions are closed automatically or by user action.

• License Compliance and Violations
  Understand correct license usage, avoid token sharing, and ensure compliance with ERP.net licensing terms.

• Token Lifetime and Renewal
  Learn how access and refresh tokens expire and renew independently from sessions.