curl --request POST \
  --url https://api.aichs365.com/api/v1/getAccessToken \
  --header 'Content-Type: application/json' \
  --data '
{
  "app_id": "app id+中文",
  "signature": "5e63696a5f377471c2aa32b21605852d",
  "sign_ver": "1.0",
  "timestamp": 1788062400123
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    app_id: 'app id+中文',
    signature: '5e63696a5f377471c2aa32b21605852d',
    sign_ver: '1.0',
    timestamp: 1788062400123
  })
};

fetch('https://api.aichs365.com/api/v1/getAccessToken', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.aichs365.com/api/v1/getAccessToken"

payload = {
    "app_id": "app id+中文",
    "signature": "5e63696a5f377471c2aa32b21605852d",
    "sign_ver": "1.0",
    "timestamp": 1788062400123
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)