# Page Not Found

The URL `features/security/sms-verification` does not exist.

You might be looking for one of these pages:
- [Secondary Verification Method](https://support.referralhero.com/campaign-builder/unique-identifier/sms-verification.md)
- [Blacklist](https://support.referralhero.com/settings/security/blacklist.md)
- [Phone Number Verification](https://support.referralhero.com/campaign-builder/unique-identifier/phone-number-verification.md)
- [Security](https://support.referralhero.com/settings/security.md)
- [Quick Add Referral Verification](https://support.referralhero.com/campaign-builder/unique-identifier/quick-add-referral-verification.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://support.referralhero.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://support.referralhero.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/campaign-builder/unique-identifier/sms-verification.md`)
- Use `Accept: text/markdown` header for content negotiation