External buyer and seller A2A demo

See a standalone buyer discover a synthetic seller, browse a scoped catalog, inspect source freshness, and test purchase refusal and credential revocation.

See an outside buyer talk to a seller

This walkthrough uses a synthetic local merchant. The buyer is a standalone Python process, not an AgenticOrg buyer agent. It speaks the A2A v1 HTTP+JSON message protocol to an AgenticOrg Seller Commerce Agent. A real external client needs merchant-issued access; knowing an Agent Card URL is not enough.

1Create a local seller
Three synthetic products and their price/inventory snapshots are placed in a development database.
2Add source evidence
A local catalog cache record is linked to the exact connector evidence reference.
3Approve one buyer
A tenant/merchant/seller/buyer-scoped credential is issued to a separate process.
4Ask over A2A
The buyer discovers the card and sends catalog and product questions over HTTP.
5Respect the boundary
A purchase request is refused; no order, payment or hold is created.
6Revoke and clean up
The buyer receives HTTP 401 after revocation and temporary rows are removed.

What the buyer sees

Synthetic product	Price snapshot	Quantity snapshot
Canvas Tote	INR 1299	7
Ceramic Mug	INR 499	12
Pocket Notebook	INR 249	20

The buyer asks to see this catalogue, then asks about the tote. The seller gives a price and inventory snapshot with a freshness label and says that final price needs merchant confirmation. These are local teaching fixtures, not merchant offers.

When the buyer asks to buy two totes, the seller refuses transaction execution. That is the correct result for this A2A question route. An answer cannot reserve stock, collect money, or create a confirmed order. For a real purchase, the merchant system and authorized fintech/payment rail must confirm their own outcomes through separate approved integration steps.

Try it on a development stack

Apply local migrations and start the development API with local PostgreSQL and Redis. From the repository root, with local AGENTICORG_ENV, AGENTICORG_DB_URL, and AGENTICORG_REDIS_URL configured, run:

python -m examples.a2a_commerce_demo.run_demo `
  --base-url http://127.0.0.1:8000 `
  --confirm-local-synthetic

The runner rejects production or non-local targets. It keeps the buyer token out of output, revokes it after the questions, and removes its synthetic seller, evidence, and cache records. Read the full local demo guide for setup and expected results.

Taking a real merchant further

The real path uses authorized Shopify read-only sync, Grantex-issued and verified OACP artifacts, an AgenticOrg cache, merchant-scoped buyer access, and an external A2A client configured for the endpoint. Do not substitute this synthetic record for signed authority. A2A interoperability is not a promise that every vendor automatically discovers this seller. Payment and mandate execution are owned by their fintech/provider; AgenticOrg's current A2A seller conversation is non-binding.

Next: Commerce guide, API and A2A integration.

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