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

# Guest Access Codes

> Cendra automatically creates unique smart lock access codes for each guest reservation and revokes them at checkout. Codes are tied to check-in/out dates and work with Yale, August, Schlage, and 20+ lock brands.

Cendra automatically creates unique smart lock access codes for each guest reservation and revokes them at checkout. No manual code management — Cendra handles the entire lifecycle based on your reservation data from your PMS.

<Info>**Quick link:** Open Access Codes in Cendra — [https://app.cendra.ai/home-automation/access-codes](https://app.cendra.ai/home-automation/access-codes)</Info>

## How Guest Access Codes Work

1. **New reservation syncs from PMS** — Cendra detects a confirmed booking with check-in/out dates
2. **Code created** — Cendra generates a unique access code on the property's smart lock via Seam
3. **Code activated** — the code becomes active at the check-in time
4. **Guest arrives** — they use the code to unlock the door (you can share the code via WhatsApp or email using AI agents)
5. **Code revoked** — at checkout time, Cendra automatically removes the code from the lock

## Code Lifecycle

| Stage       | When                  | What happens                                    |
| ----------- | --------------------- | ----------------------------------------------- |
| **Created** | Reservation confirmed | Unique code generated and scheduled on the lock |
| **Active**  | Check-in time         | Code works on the lock                          |
| **In use**  | During stay           | Guest can lock/unlock with their code           |
| **Revoked** | Check-out time        | Code is automatically removed from the lock     |

## Sharing Codes with Guests

Cendra's AI agents can share access codes with guests automatically through your communication channels:

* **WhatsApp** — AI sends the code as part of pre-arrival instructions
* **Email** — included in check-in information emails
* **Timed delivery** — codes can be shared 24 hours before check-in, or at any time you configure

The AI agent references the access code from the property's device data — it's part of the knowledge the AI uses when responding to check-in questions.

## Security

* **Unique codes per reservation** — every guest gets a different code
* **Time-bound** — codes only work during the reservation period
* **Automatic cleanup** — no forgotten active codes from past guests
* **Audit trail** — Cendra logs when codes are created, used, and revoked
* **Real-time status** — see which codes are currently active on each lock

## Supported Locks

Guest access codes work with any Seam-compatible smart lock that supports temporary codes, including:

* Yale smart locks and deadbolts
* August smart locks
* Schlage smart locks
* Level Lock
* Igloohome locks and lockboxes
* Kwikset smart locks
* Nuki smart locks
* And 15+ additional brands

## Combining with AI Agents

The most powerful setup combines guest access codes with Cendra's AI agents:

1. **Guest asks "how do I get in?"** → AI retrieves the access code and property entry instructions from the knowledge base
2. **Pre-arrival message** → AI automatically sends check-in instructions with the access code 24 hours before arrival
3. **Guest reports lock issue** → AI troubleshoots (battery check, code verification) and escalates to your team if needed