> ## Documentation Index
> Fetch the complete documentation index at: https://docs.anchorage.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Buy with a linked card

> What the agent supplies on a card purchase. For mechanics, see Linked cards.

A card purchase takes three steps and one human passkey approval. For the
lifecycle, approval flow, ownership model, and per-purchase invariants
(one-shot credentials, merchant binding, terminal denials), see
[Linked cards](/agentic-banking/concepts/cards). This page lists what the agent supplies.

## Purchase request

* Amount and currency.
* A short merchant-facing description.
* An idempotency key, unique per intent.
* Optionally, a hint for which card the approval page should default to.

Anchorage Agentic Banking returns a `purchase_request_id`, a
`pending_approval` status, and an `approval_url` for the user to open.

## Polling and expiry

The agent long-polls for the verdict (\~25 s per call) using the same
idempotency key. PurchaseRequests expire 2 hours after creation; until then
the agent can keep polling.

## Credential retrieval

After the user approves, the agent requests credentials, providing:

* Merchant name and URL.
* Merchant country code.
* For physical goods, the shipping block: `shipping_line1`,
  `shipping_line2`, `shipping_city`, `shipping_region`,
  `shipping_postal_code`, `shipping_country`, and an optional `products`
  JSON.

Anchorage Agentic Banking returns a card credential — number, expiry,
CVC. The agent fills the merchant's checkout form with the returned
credential.