구독을 위한 추가 기능

const session = await client.checkoutSessions.create({
  product_cart: [
    {
      product_id: 'pdt_123',
      quantity: 1,
      addons: [
        {
          addon_id: 'addon_456',
          quantity: 3 // 3 additional seats
        }
      ]
    }
  ],
  customer: { email: 'customer@example.com' },
  return_url: 'https://yourapp.com/success'
});

session = client.checkout_sessions.create(
    product_cart=[
        {
            "product_id": "pdt_123",
            "quantity": 1,
            "addons": [
                {
                    "addon_id": "addon_456",
                    "quantity": 3  # 3 additional seats
                }
            ]
        }
    ],
    customer={"email": "customer@example.com"},
    return_url="https://yourapp.com/success"
)

curl -X POST https://test.dodopayments.com/checkouts \
  -H "Authorization: Bearer $DODO_PAYMENTS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "product_cart": [
      {
        "product_id": "pdt_123",
        "quantity": 1,
        "addons": [
          {
            "addon_id": "addon_456",
            "quantity": 3
          }
        ]
      }
    ],
    "customer": {"email": "customer@example.com"},
    "return_url": "https://yourapp.com/success"
  }'

// Add add-ons to existing subscription
await client.subscriptions.changePlan('sub_123', {
  product_id: 'pdt_new',
  quantity: 1,
  proration_billing_mode: 'difference_immediately',
  addons: [
    { addon_id: 'addon_123', quantity: 2 }
  ]
});

// Remove all existing add-ons
await client.subscriptions.changePlan('sub_123', {
  product_id: 'pdt_new',
  quantity: 1,
  proration_billing_mode: 'difference_immediately',
  addons: [] // Empty array removes all existing add-ons
});

# Add add-ons to existing subscription
client.subscriptions.change_plan(
    'sub_123',
    product_id='pdt_new',
    quantity=1,
    proration_billing_mode='difference_immediately',
    addons=[
        {'addon_id': 'addon_123', 'quantity': 2}
    ]
)

# Remove all existing add-ons
client.subscriptions.change_plan(
    'sub_123',
    product_id='pdt_new',
    quantity=1,
    proration_billing_mode='difference_immediately',
    addons=[]
)