使用PayPal应用编程接口计算活跃订阅量？

import requests
import json

# PayPal API密钥
api_key = 'YOUR_API_KEY'

# PayPal API端点
api_endpoint = 'https://api.paypal.com'

# 获取订阅列表
def get_subscriptions():
    headers = {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer ' + api_key
    }
    response = requests.get(api_endpoint + '/v1/billing/subscriptions', headers=headers)
    subscriptions = json.loads(response.text)
    return subscriptions

# 计算活跃订阅量
def calculate_active_subscriptions():
    subscriptions = get_subscriptions()
    active_subscriptions = 0
    for subscription in subscriptions['subscriptions']:
        if subscription['status'] == 'ACTIVE':
            active_subscriptions += 1
    return active_subscriptions

# 打印活跃订阅量
print('活跃订阅量：', calculate_active_subscriptions())