How Issuers Verify AI Agents During Authorization

Issuer Authorization Checklist (Before Approving)

Issuer-side approval should include:

• Agent identity verification — agent credential/public key is valid and not revoked.
• Consent receipt validation — signature verifies, scope/constraints match, receipt is unexpired, and nonce freshness is satisfied.
• Policy rule evaluation — risk signals, velocity limits, geography restrictions, and compliance rules are applied.
• Deterministic decision output — produce YES/NO with stable reason codes and structured checks.
• Audit evidence — log proof object hash and failure reason (without storing PII).

For the end-to-end chain, see verified AI agent payments.

Issuer Authorization Graph

This diagram shows the authorization pipeline at the issuer decision point:

Issuer Failure Modes (Decision-Time Rejections)

What Issuers Need to Verify

Issuers evaluate three categories of evidence before authorizing an agent transaction:

1. Agent identity — Is the agent credential valid and bound to a known entity?
2. User consent — Does the agent hold a valid consent receipt from the delegating user?
3. Policy compliance — Does the transaction satisfy the issuer's rules (amount, geography, merchant category, velocity)?

Issuer Authorization Flow

The issuer receives a structured verification signal, not a raw card authorization request.

Identity Verification

The issuer verifies the agent's public key or credential against a registry. If the credential is revoked, expired, or unknown, the transaction is declined. See authentication mechanisms for the supported credential types.

Consent Receipt Validation

The issuer checks: signature authenticity, scope match, constraint compliance (amount, merchant, time), nonce freshness, and expiry. If any check fails, the transaction is declined with a specific reason. See consent framework.

Policy Rule Evaluation

Beyond consent, issuers apply their own rules: risk scoring, velocity limits, geographic restrictions, merchant allowlists/blocklists, and compliance checks (AML, sanctions). The authorization model defines how these rules compose.

Risk Signals for Agent Transactions

Agent-specific risk signals include:

• Agent credential age and reputation
• Transaction frequency (velocity) relative to consent scope
• Geographic consistency between agent, merchant, and user
• Amount patterns relative to historical behavior
• Offline verification window duration

What Issuers Should Log

For audit and compliance, issuers should log: receipt ID, agent ID, delegator ID (pseudonymous), verification result (YES/NO), failure reason if declined, timestamp, and proof object hash. No PII should be stored in the log.