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

# Verify an enhanced-tier agent payment

> Quickstart for verifying an enhanced-tier Stamped Mandate, including the EIP-712 signature.

This quickstart will walk a **verifier** through validating both the Stamped Mandate's JWT and its EIP-712 signature for an enhanced-tier request.

<Snippet file="product-term-disambiguation.mdx" />

A <Tooltip headline="Stamped Mandate" tip="A signed authorisation a user grants for specific scoped actions — delivered on the wire as a PINT." cta="Glossary →" href="/glossary">Stamped Mandate</Tooltip> is delivered over the API as a `PINT` (header `x-sumvin-pint-token`). This is the **Enhanced** [Sigil verification tier](/merchant/verification-tiers) — alongside the JWT you also verify the original EIP-712 signature from the `X-Pint-Signature` and `X-Pint-Payload` headers.

<Info>
  Enhanced-tier verification is an early-access flow. Partners onboarding now get hands-on with the EIP-712 agent signature shape before it hits mainstream traffic, and help us prioritise verifier tooling — contact your account manager to join the cohort.
</Info>

## What this page will cover

* Prerequisites (registered audience, access to EIP-712 verification libraries)
* Validate the Stamped Mandate's JWT as in the standard flow
* Recover and validate the EIP-712 signature against the signer
* Reconcile the signer identity with the JWT subject

## Related

* [Verification tiers](/merchant/verification-tiers)
* [Verify PINT signature](/merchant/verify-pint-signature)
* [Headers reference](/merchant/headers)