Buy credit for the workspace wallet with your own saved card [write, owner or admin]

Charges the caller's own saved card the credit plus the card processing fee and adds the credit to the workspace wallet. The caller's own balance, card and auto top-up are not changed. amount is 1000, 2000, 5000 or 10000 cents. request_id makes a repeat of the same request charge once (200 instead of 201). 409 card_required when the caller has no saved card (add one to your own account first), 402 card_declined, 409 workspace_wallet_missing before the wallet exists, 503 payments_unavailable where card payments are not set up. A workspace key or a restricted credential cannot buy credit.