验证码模板参数格式错误

import requests

def generate_captcha(template_id, width, height, length, captcha_type, expire_time):
    url = "https://api.example.com/generate_captcha"
    payload = {
        "template_id": template_id,
        "width": width,
        "height": height,
        "length": length,
        "type": captcha_type,
        "expire_time": expire_time
    }
    
    response = requests.post(url, json=payload)
    
    if response.status_code == 200:
        return response.json()
    else:
        raise Exception(f"Failed to generate captcha: {response.text}")

# 示例调用
try:
    result = generate_captcha(
        template_id="12345",
        width=200,
        height=100,
        length=6,
        captcha_type="mixed",
        expire_time=300
    )
    print(result)
except Exception as e:
    print(e)