Draw and return the single-use virtual card for an APPROVED purchase request. Call this exactly ONCE, only when you are ready to pay. The card details (number, expiry, CVC) are returned inline and shown a SINGLE time — store them immediately and complete the purchase. Drawing is final and happens once (the card can't be drawn again or handed back), so do NOT call this speculatively, to poll status (use check_status for that), or more than once. There is no re-draw: a second call returns already_retrieved. If the request is not yet approved, call check_status and wait until it is. The response also returns cardholder_name and billing_address (line1, line2, city, state, postal_code, country_code). Use them verbatim for the BILLING section of checkout: they are what the card issuer has on file, and the merchant's address check (AVS) compares against them, so substituting anything else will get the purchase declined. Any field the account owner has not filled in is null; if the merchant requires a field that came back null, say so rather than inventing a value. These are NOT a shipping address. If checkout needs somewhere to deliver to, ask the user for a shipping address separately and never reuse the billing address for it unless the user tells you they are the same. After you attempt checkout with this card, ALWAYS call report_purchase_outcome with this request_id: outcome completed if the merchant took the payment, or not_completed with the merchant's message if it was declined or didn't go through.