API request what needs HMAC SHA-256 encryption

Hello,

I need to request data from API to Power Query, but request payload needs SHA-256 encryption. Googling reveals years old posts where people state that its not possible to use this cryptograhy in Power Query. I would appreciate your help if you knew if its still the case or there is work around. Below is code of how i would do request to API with Python. 

API_ROOT = 'xxxxxxxx'

public_key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

private_key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

call_string = 'events/<event_id>?query1=value1&query2=value2'

timestamp_sec = int(time.time())

msg = ','.join([public_key,
str(timestamp_sec),
call_string,])

signature = hmac.new(
private_key.encode('utf-8'),
msg=base64.b64encode(msg.encode('utf-8')),
digestmod=hashlib.sha256
).hexdigest()

headers = {
'Accept': 'application/json; charset=utf-8',
'Authorization': 'xxxx public_key={}, timestamp={}, signature={}'.format(public_key, timestamp_sec, signature),
}

request = urllib.request.Request(API_ROOT + call_string, headers=headers)
response = urllib.request.urlopen(request)
data = json.loads(response.read())