如何在c++winapi中连接PayPal的结帐和IWebBrowser2？

#include <Windows.h>
#include <WinInet.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 创建窗口
    HWND hwnd;
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WindowProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, _T("MyWindowClass"), NULL };
    RegisterClassEx(&wc);
    hwnd = CreateWindow(wc.lpszClassName, _T("PayPal Checkout"), WS_OVERLAPPEDWINDOW, 100, 100, 800, 600, NULL, NULL, wc.hInstance, NULL);

    // 创建IWebBrowser2对象
    IWebBrowser2* pWebBrowser = NULL;
    CoInitialize(NULL);
    CoCreateInstance(CLSID_InternetExplorer, NULL, CLSCTX_LOCAL_SERVER, IID_IWebBrowser2, (void**)&pWebBrowser);

    // 导航到PayPal结账页面
    BSTR url = SysAllocString(L"https://www.paypal.com/checkout");
    VARIANT emptyVariant;
    VariantInit(&emptyVariant);
    pWebBrowser->Navigate(url, &emptyVariant, &emptyVariant, &emptyVariant, &emptyVariant);

    // 显示窗口
    ShowWindow(hwnd, SW_SHOWDEFAULT);
    UpdateWindow(hwnd);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    // 释放资源
    pWebBrowser->Release();
    CoUninitialize();

    return 0;
}