Transfer funds from SPOT to ISOLATED_MARGIN

trying to transfer fudns from spot to isolate margin using following api request →

There is my query string

https://api.binance.com/sapi/v1/margin/isolated/transfer?asset=USDT&symbol=COCOSUSDT&transFrom=SPOT&transTo=ISOLATED_MARGIN&amount=15&recvWindow=60000&timestamp=1678039250000&signature=my_signature

I get response - Mandatory parameter ‘amount’ was not sent, was empty/null, or malformed.

What’s wrong with amount??

Thanks

Try again but format the amount as a decimal, eg. 15.00

I’ve found bug. There is the solving -
“amount” => round($amount,8)

Thanks