> For the complete documentation index, see [llms.txt](https://docs.uidai.gov.in/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.uidai.gov.in/readme/app-to-app-credential-flows/uidai-specifications.md).

# UIDAI Specifications

### 1. Introduction

This is an API specification document to enable interaction between AUA/OVSE application and UIDAI's aadhaar app.

Aadhaar app released by UIDAI enables an AUA/OVSE application - app or portal to use face authentication using app-app intent or QR code intent in both android and ios environment. The aadhara provides following capabilities:

1. Secure interface to capture live person image for online Aadhaar auth/eKYC is supported by **CAPTURE intent** api. This intent provides pid block
2. Secure interface to capture live person image for offline match using UIDAI signed eKYC xml is supported by **OFFLINE FACE MATCH intent** api.
3. Secure interface to capture live person image for offline match using UIDAI signed eKYC xml is supported by **ONLINE FACE MATCH intent** api.
4. Secure exchange of the selective demographics attributes through **CREDENTIAL intent** api. Demographuic exchange could be with or without ONLINE or OFFLINE Face Authentication.

All Aadhaar enabled AUA applications to handle face biometric data in accordance to Aadhaar Registered Devices Technical Specification - version 2.0 (Revision 6)[**document link**](https://uidai.gov.in/images/resource/Aadhaar_Registered_Devices_2_0_4.pdf)

UIDAI has released a sample reference AUA/OVSE integration project to help developers quick start the headless app intents integration.


---

# 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:

```
GET https://docs.uidai.gov.in/readme/app-to-app-credential-flows/uidai-specifications.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.