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Connect the agent using its private Transfer key. The key selects its assigned card; tool arguments cannot choose another card or wallet.
  1. Call get_agent_card to inspect masked metadata, card status, and source. For an external card, bank limits and remaining balance are unknown and the monetary limit fields are null.
  2. If external access is enabled, checkout configuration is ready, and Browser Tokens preview access is approved, call get_payment_card. Use its short-lived token only through the returned proxy in a compatible browser with Evervault CA trust.
  3. The owner may need to enter CVC directly at the merchant or complete bank authentication. Retrieving access does not itself make a payment.
A card can be securely linked before checkout approval. In that state usable_for_checkout is false, and payment access is unavailable while metadata remains readable. A true readiness value does not prove merchant compatibility. External transaction history is an empty list with a no-bank-feed message. Do not interpret token creation as evidence of a charge, settlement, or a Transfer wallet debit. Simulation-mode cards return deliberately invalid dummy details and cannot be used for checkout. Transfer-issued live cards and wallet funding are coming soon. See Bring your own card, Payment details REST API, and Get payment card MCP.