Create a collateral OCO (one-cancels-the-other) order combining limit and stop-limit via the V4 API.
The public WhiteBIT API key.
Base64-encoded JSON request body.
HMAC-SHA512 signature of the payload, hex-encoded. Computed as hex(HMAC-SHA512(payload, api_secret)).
"BTC_USDT"
buy, sell "buy"
"0.001"
"40000"
"41000"
"42000"
"{{request}}"
"{{nonce}}"
"order1987111"