Nomotic, Inc. The Agent Transfer Protocol (AGTP) specifies the sending side of an agentic transaction: agent identity, Authority-Scope enforcement, Budget- Limit declaration, and a signed Attribution-Record on every method invocation. The receiving side of a PURCHASE transaction -- the merchant or service provider -- has no equivalent protocol-level identity or verification mechanism. This is the merchant identity gap. This document specifies the AGTP Merchant Identity and Agentic Commerce Binding. It defines the Merchant Manifest Document, a signed identity record structurally parallel to the Agent Manifest Document; the Merchant Birth Certificate, the genesis record from which a merchant's canonical identifier is derived; Merchant Trust Tiers aligned with AGTP Trust Tier semantics; and the protocol integration points at which merchant identity is verified. These include the PURCHASE method handshake, the DISCOVER method result surface, and the Attribution-Record. This document also defines the Intent-Assertion header for portable, detached principal- authorized intent, the Cart-Digest mechanism for multi-line-item transactions, and the 455 Counterparty Unverified status code. Together these mechanisms close the verification loop between agent and merchant within AGTP's governance model.