> For the complete documentation index, see [llms.txt](https://docs.emudhradigital.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emudhradigital.com/help-center/faqs.md).

# FAQs

Answers to the most common questions about eSign, drawn from the CCA eSign FAQ and the questions signers and integrators ask most often.

* **eSign Basics** — what eSign is, legal validity, who can use it, privacy and certificates
* **Signing and Authentication** — OTP, VID, fingerprint, iris, face, timeouts and PINs
* **Certificates and Validation** — Adobe validation, 30-minute certificates, long-term validation
* **Integration and ASP** — onboarding, audits, common API errors, migration and SDKs