> For the complete documentation index, see [llms.txt](https://checker-docs.gitbook.io/checker-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://checker-docs.gitbook.io/checker-docs/1.-getting-started/1.3-using-ltd-codes-a-guide-to-ltd-codes.md).
# 1.3 Using LTD Codes: A Guide to LTD Codes
**1.3.1 What are LTD Codes?**
Lifetime Deal (LTD) codes are promotional codes that grant users access to services for an extended period or even lifetime access. These codes help you obtain permanent access to Checker’s services.
**1.3.2 How to Use an LTD Code**
If you have a lifetime code, you must enter it in the promotional code field on the registration screen and register to activate it. When you do this, the defined package features will automatically be reflected in your account.
If you have more than one promo code, you can add them in the dashboard.
**1.3.3 Advantages of LTD Codes**
* **Cost Savings:** A one-time payment grants long-term access, saving on recurring costs.
* **Feature Access:** LTD often provides access to all premium features or extended usage limits.
Important notice promotions may not always be active. some promotions include these codes.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://checker-docs.gitbook.io/checker-docs/1.-getting-started/1.3-using-ltd-codes-a-guide-to-ltd-codes.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.