上传电子小票

商户将支付成功回传的参数填入指定字段，可以给指定微信支付订单上传电子小票。 上传成功后，用户可以在账单详情页看到商户上传的电子小票。 官方文档

const { Multipart, Rsa } = require('wechatpay-axios-plugin')
const { createReadStream } = require('fs')
const { basename } = require('path')

const localFilePath = '/path/to/merchant-receipt-file.jpg'
const stream = createReadStream(localFilePath)
const media = new Multipart()
  .append('meta', JSON.stringify({
    transaction_id,
    transaction_mchid,
    transaction_sub_mchid,
    out_trade_no,
    openid,
    upload_time,
    merchant_contact_information: {
      consultation_phone_number: Rsa.encrypt(phone_number, platformCertificateInstance),
    },
    sha256: 'from upstream or local calculated',
  }))
  .append('file', stream, basename(localFilePath))

wxpay.v3.marketing.shoppingReceipt.shoppingreceipts.post(media, { headers })
.then(
  ({ 
    data: {
      receipt,
    },
  }) => ({
    receipt,
  })
)