Queues wallet creation for a currency. Requires the OPERATIONS permission where user policies apply. HTTP 201 acknowledges the request; no wallet ID or deposit address is returned here. Check GET /wallet/requests for progress and GET /wallets for the created addresses. Existing wallets and active duplicate requests are rejected. BUSD and TRX creation are currently blocked even though those currency codes pass request validation. Other currencies remain subject to provider support. Do not deposit until an address is returned by the wallet list.