默认标题
<p>1、获取公众号AppId
2、在商户平台 切换到左上角微信支付->安全中心->API安全 申请apiV3版证书（建议用新的v3版本）
<img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=a5d901c3b176b6861b776dcb9557541f&amp;file=file.png" alt="" />
3、根据指引生成证书
<img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=96fc23555ec0e9106bce9049b769858c&amp;file=file.png" alt="" />
4、下载辅助工具
<a href="https://pay.weixin.qq.com/docs/merchant/sdk-tools/signature-verification-tool.html">https://pay.weixin.qq.com/docs/merchant/sdk-tools/signature-verification-tool.html</a>
<img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=da4fc24b152fab12ae61e6eb77246f7d&amp;file=file.png" alt="" />
<img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=172bef9e518a5cf54981236815bbec37&amp;file=file.png" alt="" />
密码为商户号
<img src="https://www.showdoc.com.cn/server/api/attachment/visitFile?sign=cd00da59673bc3a32b52f55e3eace222&amp;file=file.png" alt="" /></p>