When using CoefontAPI, it must be signed using HMAC-SHA256.
Please set the header appropriately based on the following specification.

Hashing

The following flow is used to hash the data.

1. encode the request body into json format.
2. Combine UNIX time (UTC) and json-encoded request body in this order.
3. Hash the above data with HMAC-SHA256 using the access secret.
   If the request body is not present, only the current time is hashed.

Example implementation in python3.8(/text2speech)

  import hmac
  import requests
  import hashlib
  import json
  from datetime import datetime, timezone

  accesskey = 'QY4Tuiug6XidAKjDS5zTQHGSI'
  access_secret = '62A03zCgPflc3NZwFHliphpKFt4tppOpdmUHgqPR'

  text = 'これはテストです。'
  date: str = str(int(datetime.utcnow().replace(tzinfo=timezone.utc).timestamp()))
  data: str = json.dumps({
    'coefont': '2b174967-1a8a-42e4-b1ae-5f6548cfa05d',
    'text': text
  })
  signature = hmac.new(bytes(access_secret, 'utf-8'), (date+data).encode('utf-8'), hashlib.sha256).hexdigest()

  response = requests.post('https://api.coefont.cloud/v2/text2speech', data=data, headers={
    'Content-Type': 'application/json',
    'Authorization': accesskey,
    'X-Coefont-Date': date,
    'X-Coefont-Content': signature
  })

  if response.status_code == 200:
    with open('response.wav', 'wb') as f:
      f.write(response.content)
  else:
    print(response.json())