Product checkout conversion spec

Purpose

Our goal is to let ChatGPT directly invoke partner apps for high-intent use cases such as product checkout.

Once partners provide us with a product feed for search, we can hook up their apps for bottom-of-funnel conversion actions. To do this, partner apps need to follow a standardized contract for widget name, tool name, and tool input.

If you want to build an app that follows this spec, apply for access through the ChatGPT merchants form.

User experience

When users search for products, the product entity sidebar can show Open buttons for sellers. If a seller has a ChatGPT app, ChatGPT can open that app inline for checkout instead of punching out to an external website.

Required contract (today)

• Widget name: ui://widget/checkout-session.html
• Tool name: checkout_session

checkout_session must set:

_meta.ui.resourceUri = "ui://widget/checkout-session.html";

Any tool called directly from a widget must set:

_meta["openai/widgetAccessible"] = true;

checkout_session input

Current input shape:

{
  "checkout_session": {
    "items": [
      {
        "id": "string",
        "quantity": 1,
        "offerId": "string"
      }
    ]
  }
}

This payload aligns with the Commerce checkout session shape documented here.