https://spec72.dev/ https://spec72.dev/thanks/ https://spec72.dev/sample/ https://spec72.dev/sample/a2a-receipt/ https://spec72.dev/opslane/ https://spec72.dev/opslane/order.html https://spec72.dev/opslane/services.json https://spec72.dev/sample/cert-xrpl-x402-handoff.html https://spec72.dev/llms.txt https://spec72.dev/SKILL.md https://spec72.dev/skills/xrpl-x402-handoff/ https://spec72.dev/skills/xrpl-x402-handoff/SKILL.md https://spec72.dev/lint https://spec72.dev/audit/ https://spec72.dev/scan https://spec72.dev/vibe-fix https://spec72.dev/escrow-check https://spec72.dev/terms https://spec72.dev/privacy https://spec72.dev/refunds https://spec72.dev/.well-known/agent-card.json