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 a merchant in AGTP as an agent whose Agent Identity Document carries role: "merchant", specifies the merchant-specific fields that ride on the Agent Identity Document under that declaration, aligns Merchant Trust Tiers with AGTP Trust Tier semantics, and defines 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 458 Counterparty Unverified status code. Together these mechanisms close the verification loop between agent and merchant within AGTP's governance model. Version 02 unifies merchant identity onto the Agent Genesis + Agent Identity Document architecture: there is no separate Merchant Genesis document type. A merchant is an agent with role: "merchant" declared in its Agent Identity Document. This reflects the architectural principle that identity is permanent (carried on Genesis) and capability is mutable (carried on the Identity Document); a role change does not re-mint an Agent-ID.