> For the complete documentation index, see [llms.txt](https://docs.certn.co/api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.certn.co/api/faq.md).

# FAQ

## API Requests

### Are there limits on how many requests I can send in a certain period of time?

Certn's API has a rate limit of:

* 240 requests/minute (60s rolling window) and 
* 14,400 requests/day (24hr rolling window).

## Checks

### What is a quickscreen, and how do I use it?

A quickscreen allows you to run a check on an applicant without involving the applicant. 

* When running a quickscreen, add `/quick` to the URL.
* The response you get from a quick screen is set to `ANALYZING`. To receive live results, [setup a webhook](/api/guides/use-the-api/webhooks.md), or make a [subsequent call](/api/start/demo-account/retrieve-results.md).

**Pre-requisite:** Obtain all the required information prior to running the check, and include it in your request.

{% hint style="warning" %}
Make sure to obtain the [proof of consent](/api/guides/use-the-api/consent.md) from your applicant **before** running the quickscreen.
{% endhint %}

### **What is an invite, and how do I use it?** 

An invite allows you run a check on an applicant by inviting them to provide the required information and complete the appropriate consents via an email or SMS invite from Certn.

### **What is a manual review, and how does it work?**

When filing an application with an [Enhanced Identity Verification](/api/guides/checks/enhanced-identity-verification.md), applicants upload a selfie and pictures of their ID. If our tool cannot validate them, it flags the application for Manual Review.

A customer support agent from our team then reaches out to the applicant via the email on file and asks them to upload new photos. Once received, our agents re-process the application.

## Retention policies

Refer to our [privacy policy](https://certn.co/privacy-policy/) for all details regarding our retention policies.