Requests a withdrawal from your Trading balance. Requires the WITHDRAWAL permission where user policies apply, a signed current contract, an eligible account and sufficient withdrawable balance. Amount is truncated to the currency precision. Network/address checks and provider processing can still reject a queued withdrawal. If account approval is required, HTTP 202 returns an approval request; a reused approval key can return the existing request with its current status. Otherwise HTTP 201 acknowledges the queued withdrawal and returns no withdrawal ID. Neither response confirms a blockchain transfer. Follow GET /withdrawals for the recorded result. If the request times out or returns an uncertain error, check existing requests before submitting again; general duplicate-free retry is not guaranteed.