Guide
Give your AI agent a checkout tool
Connect Claude or GPT to a catalog, checkout session and durable order record.
Read guideOrderCore / Field notes
Build agents that
finish the order.
Practical guides to checkout, retries and the systems around them. Written for developers putting AI agents to work.
Latest · Reliability · 15 September 2026
Two deliveries.
One order update.
Handle repeated checkout events with signature checks, a durable inbox and a local demo you can run without credentials.
Read the webhook retry guide ↗A receiver built for retries
delivery-42APPLIEDdelivery-42SKIPPEDVerify the signature.
Commit the update once.
Guides, tutorials & research
API documentation ↗Reliability
Idempotent orders for AI agents
Understand why retries create duplicates and where an idempotency key belongs.
Read reliabilityMCP
What is an MCP commerce server?
Learn how a commerce tool server connects an agent to catalog and checkout operations.
Read mcpTutorial
Build a “reorder my usual” agent tool
Turn an earlier order into a new, explicitly requested purchase with a clear retry boundary.
Read tutorialTutorial
GPT function calling and idempotent checkout
Walk through the tool loop and a checkout retry that resolves to one order.
Read tutorialComparison
OrderCore vs Stripe Agent Toolkit
Compare payment tools with the catalog, order and checkout layer an agent needs.
Read comparisonComparison
OrderCore vs Stripe and a custom backend
See what you need to own when building an agent commerce backend yourself.
Read comparisonResearch
Agent commerce readiness in 2026
Read the published readiness study, its methodology and its limits.
Read researchFrom reading to running
Try the checkout retry yourself.
The offline demo completes the same checkout twice and checks that one order comes back. No API key or payment account required.
Run the offline demo