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ap2-cryptographic-signing

Implement AP2 cryptographic signing for hardware-backed user and merchant mandates.

35|16|Updated Mar 4, 2026
Search Tags:#security#authentication#cryptography#signing#mandate#ap2#vdc
One-click install
npx skills add https://github.com/OrcaQubits/agentic-commerce-claude-plugins --skill ap2-cryptographic-signing
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ap2-cryptographic-signing
Source: https://github.com/OrcaQubits/agentic-commerce-claude-plugins/tree/main/ap2-agentic-payments/skills/ap2-cryptographic-signing
Command: npx skills add https://github.com/OrcaQubits/agentic-commerce-claude-plugins --skill ap2-cryptographic-signing

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill enables the implementation of robust cryptographic signing for AP2 mandates, ensuring verifiable user intent, merchant commitment, and data integrity, which is crucial for preventing fraud and resolving disputes.

Core Features & Use Cases

  • Hardware-Backed Signatures: Integrates with secure hardware for user authentication and signing.
  • VDC Integrity: Ensures the integrity of Verifiable Digital Credentials (VDCs) through cryptographic methods.
  • Mandate Signing: Supports signing of Cart, Intent, and Payment Mandates for both users and merchants.
  • Use Case: When a user is finalizing a purchase, this skill will orchestrate the secure, hardware-backed signing of the payment mandate, providing cryptographic proof of their authorization.

Quick Start

Use the ap2-cryptographic-signing skill to implement the merchant signature verification flow for a cart mandate.

Frequently Asked Questions about ap2-cryptographic-signing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement cryptographic signing for AP2 payment mandates?▼

To implement cryptographic signing for AP2 payment mandates, use SD-JWT with Key Binding and JCS canonicalization to structure your JWT header and payload for secure transaction authorization.

What is hardware-backed signing for agentic commerce transactions?▼

Hardware-backed signing for agentic commerce integrates with secure hardware to authenticate users and sign payment mandates, providing cryptographic proof of verifiable intent and non-repudiation for fraud prevention.

How does VDC integrity verification work with cryptographic signatures?▼

VDC integrity verification works by applying cryptographic signing methods to Verifiable Digital Credentials, ensuring that the credential data remains untampered and securely authenticated during attestation flows.

Do I need SD-JWT and JCS canonicalization for mandate verification flows?▼

Yes, you need SD-JWT with Key Binding and JCS canonicalization for mandate verification flows because these standards ensure consistent payload serialization and verifiable user intent across hardware-backed attestation processes.

What are the limitations of using AP2 cryptographic signing for merchant signatures?▼

The limitations of AP2 cryptographic signing include strict adherence to specific JWT header and payload requirements for mandate signing, meaning any deviation from SD-JWT or JCS canonicalization standards will break the attestation flow.

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