pay.verifySign(params) 验证签名报错: 平台证书序列号不相符，未找到平台序列号

[louisyonge]

用的是2.1.8版本的sdk，证书是微信申请的免费证书。可以正常用代码下单。支付成功，回调，验证时报错。按照文档所说，按个证书序列号非必选，所以我没填这个参数。 "errorType": "Error", "errorMessage": "平台证书序列号不相符，未找到平台序列号", "stack": [ "Error: 平台证书序列号不相符，未找到平台序列号", " at Pay. (/opt/nodejs/node_modules/wechatpay-node-v3/dist/index.js:200:35)", " at step (/opt/nodejs/node_modules/wechatpay-node-v3/dist/index.js:59:23)", " at Object.next (/opt/nodejs/node_modules/wechatpay-node-v3/dist/index.js:40:53)", " at fulfilled (/opt/nodejs/node_modules/wechatpay-node-v3/dist/index.js:31:58)", " at process.processTicksAndRejections (node:internal/process/task_queues:95:5)" ]