> ## Documentation Index
> Fetch the complete documentation index at: https://docs.briq.tz/llms.txt
> Use this file to discover all available pages before exploring further.

# Best Practices

> Recommendations for sender IDs, OTP expiry, campaign structuring, and security.

# Best Practices

## Sender ID

* Use 3–11 characters; A–Z, 0–9; avoid special chars.
* Choose a recognizable brand; keep consistent across messages.
* Some regions require pre-registration; plan lead time.

## OTP settings

* Expiry: 2–5 minutes is typical; balance UX and security.
* Length: 4–6 digits; avoid predictable sequences.
* Limit attempts and add cool-down after repeated failures.

## Campaigns vs. Instant

* Use Campaigns for bulk sends, scheduling, and analytics.
* Use Instant for transactional messages (receipts, OTPs).
* Segment recipients and personalize content when possible.

## Content quality

* Keep messages concise; include clear call-to-action.
* Localize language; consider Swahili voice/WhatsApp where relevant.

## Deliverability

* Respect quiet hours and regional regulations.
* Prefer opt-in lists; include STOP/HELP where required.

## Security

* Never log API keys or OTP codes.
* Rotate keys periodically; use per-environment keys.
* Restrict developer access per workspace.

## Links

* [Security Notes](/security-notes)
* [Error Handling](/error-handling)