Move some of your own purchased credit into the workspace wallet [write, owner or admin]

All or nothing. Only credit the caller bought moves; free credit stays. 402 insufficient_purchased_credit when the caller holds less purchased credit than the amount, 409 workspace_wallet_missing before the wallet exists. request_id makes a repeat of the same request land once (200 instead of 201); the same id with another amount is 409 idempotency_conflict.