uri + '&' + signDatauri https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/business-capabilities/virtual-payment.htmlhttps://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/business-capabilities/virtual-payment.htmlhttps://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/business-capabilities/virtual-payment.html

生成 paySig

    let appKey = config.env === 1 ? config.appKey_dev : config.appKey_prod;

    const paySig = crypto

      .createHmac('sha256', appKey)

      .update('requestVirtualPayment&' + signData)

      .digest('hex');