前端js：

代码生成相关参数：{"timeStamp":"1587373646","signType":"RSA","package":"prepay_id=wx201707****171069600","paySign":"RI1z/8E/f/xR/2tTafG23OknxINqbxlIh2pYRHDgD5KUMnfQ1qv6rE81QOAXd0w0Xig+sfWkhJd1DxewLDe0juSYnqbndcfUw6Dxe7VHRQ1CFiQAUONg2xXzT38kErgvQnqxpQY7RnIkqQsMHY3+vgGBtxL+2uO49E/YfsYWTDT5DSqWYvyBKB8wNVgFHJUerWNTvSvGqB8IPOL7IJ/ne9/eG5GIFHK3uOG6RX6x07d5F2gyiOoKBITlmm7qBt0tR8yRMk7D4SAX5c+iAsJmm9XXhhe673bSeJb5VxHi6YHcf4L2SA1EgzzUTmoDFlj41DgCGyeJGlpbdWx2Vf8jiA==","nonceStr":"fa7f927c43b54011bf7eb3b39a6e2394","appId":"wx1******7328"}

命令生成的sign值一致:

echo -n -e \

  "wx1******7328\n1587373646\nfa7f927c43b54011bf7eb3b39a6e2394\nprepay_id=prepay_id=wx201707****171069600\n" \

  | openssl dgst -sha256 -sign apiclient_key.pem \

  | openssl base64 -A

 RI1z/8E/f/xR/2tTafG23OknxINqbxlIh2pYRHDgD5KUMnfQ1qv6rE81QOAXd0w0Xig+sfWkhJd1DxewLDe0juSYnqbndcfUw6Dxe7VHRQ1CFiQAUONg2xXzT38kErgvQnqxpQY7RnIkqQsMHY3+vgGBtxL+2uO49E/YfsYWTDT5DSqWYvyBKB8wNVgFHJUerWNTvSvGqB8IPOL7IJ/ne9/eG5GIFHK3uOG6RX6x07d5F2gyiOoKBITlmm7qBt0tR8yRMk7D4SAX5c+iAsJmm9XXhhe673bSeJb5VxHi6YHcf4L2SA1EgzzUTmoDFlj41DgCGyeJGlpbdWx2Vf8jiA==

ps：

生成sign值是不是和获取平台证书的私钥一致，平台证书已经获取成功，表明商户私钥应该没有问题