> For the complete documentation index, see [llms.txt](https://support.cregis.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.cregis.com/4.-developer-and-payment-engine/waas/configuration.md).
# Configuration
To ensure request security, it is necessary to request the IP address of the Cregis API server and add it to the IP allowlist. The Cregis API only grants access to IP addresses in the whitelist.
Select the the project you created and click "API" to enter the API details.
In "IP Whitelist", click "Create Group", enter IP Address and click "Save", then use Google verification code 2FA for identity verification.
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