查询退款(单品优惠)

提交退款申请后，通过调用该接口查询退款状态。退款有一定延时，用零钱支付的退款20分钟内到账，银行卡支付的退款3个工作日后重新查询退款状态。 官方文档

wxpay.v2.pay.refundqueryv2.post({
  appid,
  mch_id,
  sub_appid,
  sub_mch_id,
  nonce_str,
  sign_type,
  transaction_id,
  out_trade_no,
  out_refund_no,
  refund_id,
  offset,
})
.then(
  ({ 
    data: {
      return_code,
      return_msg,
      result_code,
      err_code,
      err_code_des,
      appid,
      mch_id,
      sub_appid,
      sub_mch_id,
      nonce_str,
      sign,
      total_refund_count,
      transaction_id,
      out_trade_no,
      total_fee,
      settlement_total_fee,
      fee_type,
      cash_fee,
      refund_count,
      out_refund_no_$n,
      refund_id_$n,
      refund_channel_$n,
      refund_fee_$n,
      settlement_refund_fee_$n,
      coupon_type_$n_$m,
      coupon_refund_fee_$n,
      coupon_refund_count_$n,
      coupon_refund_id_$n_$m,
      coupon_refund_fee_$n_$m,
      refund_status_$n,
      refund_account_$n,
      refund_recv_accout_$n,
      refund_success_time_$n,
    },
  }) => return_code === 'SUCCESS' && result_code === 'SUCCESS'
)