Getting empty data when I get a sales summary report using the Apple Store Connect API

I would like to get the daily number of units using python and Apple store connect API
So, I wrote the code referring to the document about Apple store connect API.

However, the execution result is returned as None.

The authority of the issued API key is sales and report

I'm afraid my English not so good
If the explanation is insufficient, please let me know as I will provide additional information.

Execution Environment

Windows 10
python 3.8.4

Due to the effect of commenting out, the color coding is strange.

Code Block python
import json
import jwt
import time
import requests
from datetime import datetime, timedelta
# Signature method is fixed at ES256 
ALGORITHM = 'ES256'  
# Please list  your own key 
APP_STORE_KEY_ID = 'XXXXXXX'
ISSUER_ID = 'XXXXXXX-XXXXXXX'
STORE_AUTH_KEY = 'XXXXXXX.p8'
 
secret = ""
with open(STORE_AUTH_KEY,'r') as f:
    secret = f.read()
# Apple's stipulated token expiration date is 20 minutes
exp = int(time.mktime((datetime.now() + timedelta(minutes=20)).timetuple()))
token = jwt.encode(
    {
        'iss': ISSUER_ID,
        "exp": exp,
        "aud": "appstoreconnect-v1"  # aud is fixed at appstoreconnect-v1 
    },
    secret,
    algorithm=ALGORITHM,
    headers={
        'alg': ALGORITHM,
        'kid': APP_STORE_KEY_ID,
        "typ": "JWT"        
    }
)
 
url = 'https://api.appstoreconnect.apple.com/v1/salesReports?filter[vendorNumber]=My_vendorNumber&filter[reportType]=SALES&filter[reportSubType]=SUMMARY&filter[frequency]=DAILY&filter[reportDate]=2021-03-01&filter[version]=1_0'
hed = {'Authorization': 'Bearer {}'.format(token.decode('ascii'))}
data = {}
response = requests.get(url, headers=hed)
# data = response.json()
print(response.status_code)
response = response.apparent_encoding  # I got a json conversion error, so I added this line
print(response)
# print(json.dumps(data, ensure_ascii=False, indent=4))

Result

Code Block text
$ python get_unit.py
200
None