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It does not work for me. I take the PHP code, change the keys, and all I get is NULL

Hello. I have been using your code, concretely pythonv2 and node, but both are giving me the error of the title. I was getting errors related to padding with base64 and also with 'bytes' against 'str' format, so I had to make a workaround to solve this. My code to create the key, message and signature with python3 now looks like this:

keybytes = base64.b64encode(secret.encode())
key = base64.b64decode(keybytes)
message = str.encode(path + str(nonce), "utf-8")
hmac= hmac.new(key, message, sha512)
signature = base64.b64encode(hmac.digest()).decode()

I tried many things, like adding and retrieving 'utf-8' in encode() and decode(), tried typing the b64 operations differently, looked into my timestamp by running the code from a VPS, using different python3 versions... If you have any idea I will be happy to listen. It's clearly a base64 issue. Also present in nodejs. What version&environment are you using?

OPTIONS https://api.crex24.com/CryptoExchangeService/BotTrade/ReturnBalances 405 ()
localhost/:1 Failed to load https://api.crex24.com/CryptoExchangeService/BotTrade/ReturnBalances: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3006' is therefore not allowed access. The response had HTTP status code 405.