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

# API Key

> Frequently Asked Questions about API Key

## How to manage and use API Key?

API Key is important information used for signature verification in interface interaction. It must be used properly and not disclosed to others. After obtaining the API Key from the client, hand it over to relevant personnel for use. If the API Key is found to be leaked, please contact customer service in time to replace it.