Encrypted access token request to google api failed with 400 code - api

Question

Recently I come up a scenario where I need to encrypt a WEB API request and response using PyCryptodome inside Synapse notebook activity. I am trying to make a call to Google API, but the request should be encrypted and similarly response should be encrypted. After making the call with encrypted data, I am getting below error.
Error:
error code: 400, message: Invalid JSON Payload received. Unexpected Token, Status: Invalid argument.
I have written below code:-
import os
import requests
import json
import base64
from Crypto import Random
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
from Crypto.Util.padding import pad,unpad
import secrets
key= os.urandom(16)
iv = Random.new().read(AES.block_size)
def encrypt_data(key, data):
BS = AES.block_size
pad = lambda s: s + ((BS - len(s) % BS) * chr(BS - len(s) % BS)).encode()
cipher = AES.new(key, AES.MODE_CBC, iv)
encrypted_data = base64.b64encode(cipher.encrypt(pad(data)))
return encrypted_data
url = "https://accounts.google.com/o/oauth2/token"
client_Id = "XXXXX"
client_secret = "YYYYY"
grant_type = "refresh_token"
refresh_token = "ZZZZZZ"
access_type="offline"
data = {"grant_type":grant_type,
"client_id":client_Id,
"client_secret":client_secret,
"refresh_token":refresh_token,
"access_type":access_type
}
encode_data = json.dumps(data).encode("utf-8")
encrypt_data = encrypt_data(key,encode_data)
response = requests.post(url, data = encrypt_data)
print(response.content)
It would be really helpful if someone can give me idea or guide me on how I can achieve this.
Thank You!