[4.1公众号知识点](4.1%E5%85%AC%E4%BC%97%E5%8F%B7%E7%9F%A5%E8%AF%86%E7%82%B9.md) [4.2微信支付知识点](4.2%E5%BE%AE%E4%BF%A1%E6%94%AF%E4%BB%98%E7%9F%A5%E8%AF%86%E7%82%B9.md) [4.3防封技巧](4.3%E9%98%B2%E5%B0%81%E6%8A%80%E5%B7%A7.md)