Session ID Troubleshooting & Best Practices

Last updated: May 16, 2025

A practical guide for ensuring every critical user action in your application—sign‑up, sign‑in, withdrawals, high‑value transactions, or any other key action—carries a valid Verisoul session_id and for diagnosing why one might be missing.

1. Why a session_id Might Be Missing

Verisoul typically needs 500 – 1500 ms to initialize, collect signals, and return a token. If a request arrives without it, one of three things is happening:

  1. User (or extension) blocks Verisoul. JavaScript is disabled or a privacy / ad‑blocker drops the script.

  2. Bot bypasses the front‑end. Attackers call your API directly and never load the SDK at all.

  3. User “outruns” Verisoul. The UI lets them click before the SDK resolves.

Important: Always fail closed—reject calls that do not include a session_id. Otherwise sophisticated attackers can evade detection entirely.

1a) Why Fraudsters Often Take Longer

Fraud users frequently route traffic through distant proxies, VPNs, or Tor nodes. Extra network hops add 100‑1000 ms of latency (speed‑of‑light + congestion). Example:

User

IP Location

Verisoul Server
(300 globally)

Round Trip Data Time

Legit US user

Kentucky

Ohio

30‑100 ms

Fraudster in Bangladesh proxying to US

Kentucky

Ohio

500‑1500 ms

Longer session_id‑ready times are therefore a signal, not a bug—treat them as potential risk indicators.

2. Quick Checklist For Ensuring You Get A session_id

  1. Load the SDK first. Place the script tag in <head> or at the very top of <body>.

  2. Gate the UI. Keep the primary action button disabled (or hidden) until session_id is present.

  3. Fail closed server‑side. Reject any request that lacks a valid token.

  4. Instrument & alert. Monitor SDK latency, missing tokens, and client‑side errors.

  5. Communicate edge‑cases. Offer fallback copy or OTP flows for JS‑disabled browsers.

3. Edge‑Case Playbook

Scenario

User impact

Recommended action

JavaScript disabled

Button never enables / error message

Explain the requirement; route to e‑mail OTP or manual review.

Ad/script blocker

Same as above

Ask user to whitelist; self‑host SDK under your domain if necessary.

Slow network

Button delayed ~1‑2 s (≥ 95th percentile)

Show spinner; measure and alert on P95 SDK readiness above threshold.

Bot / API bypass

Request lacks session_id

Reject, CAPTCHA, or queue for review—this is the highest‑risk path.

4. Frequently Asked Questions

How long is a session_id valid? 24 hours. Request a new one immediately before each key action.

Should we call reinitialize() on logout? Yes, to ensure the next account’s activity is tracked separately.

Is it OK to request a token on every page? Yes, but best practice is to do so right before the action that triggers a back‑end call.

What if the user navigates away before the promise resolves? No problem—just request a new token on the next page.

Need more help?

Email support@verisoul.ai with SDK logs, browser console output, and any server‑side traces.