Example Signing Code in Python
import hashlib
import hmac
api_secret = '...'
request_header = 'amount='+str(amount)+'&nonce='+str(nonce)+'&pair='+str(pair)+'&price='+str(price)+'&side='+str(side)+'&type=limit'
encrypt = hmac.new(api_secret, request_header, digestmod=hashlib.sha512).hexdigest()