How can I progress refunding with Wix Pay or onPaymentUpdate( ) get event "Refunded"

I built payment with Wix Pay method integreate with ‘Paymentwall’ for Korean

(References 1 : Velo Tutorial: Using the Velo Pay API to Collect Payments for a Single Product | Help Center | Wix.com )
(References 2 : Velo Tutorial: Processing Payments | Help Center | Wix.com )

and I added payment data in own dataset. Here is the code

export async function createPaymentForProduct(title , price , member , data) {
  /*NOT IMPORTANT*/
  //#region GET USER INFORMATION 
  let userInfo = { firstName : '', lastName : '', phone : '', email : '', countryCode : '' };
  //RECEIVED OWN MEMBER DATASET
  if(member) {

    if(member.name) {

      userInfo.firstName = member.name.slice(1);
      userInfo.lastName = member.name.slice(0,1);

    }

    if(member.phone) userInfo.phone = member.phone;
    if(member.email) userInfo.email = member.email;
    else userInfo.email = member.id + '@hand-shake.org';

  }
  //#endregion
  /*NOT IMPORTANT*/
  
  return wixPayBackend.createPayment( {
    
    amount: Number(price),
    items: [{name: title, price: Number(price)}],
    currency: "KRW",
    userInfo : userInfo

  }).then((payment) => {
    console.log('created payment' , payment);
    //GET 'Payment transaction ID' AND THEN SAVE TO DATASET FOR MANAGING PAYMENTS
    const save = {

      _id : payment.id,
      amount : payment.amount,
      items : payment.items,
      userinfo : payment.userInfo,
      type : title,
      date : new Date(),
      members : member._id

    };
    //IF USER CALL 'CHARGING POINTS' OR 'RENT FEE'
    if(title.includes('point') === true) {

      save.point = Number(payment.amount);

    } else if(title.includes('rent') === true) {

      save.place_rent = data;

    }
    //SAVE PAYMENT TO DATASET NAMED 'payment'
    return wixData.save('payment' , save).then((saved) => {

      console.log('Payment Data Saved' , saved);
      return payment;

    }).catch((error) => {console.log(error)});

  }).catch((error) => {console.log(error)});
}

export async function wixPay_onPaymentUpdate(event) {

  let payment = await wixData.get('payment' , event.payment.id);
  payment.status = event.status;
  payment.payDate = new Date();
  
  //IF EVENT FIRED UPDATE THE SAVED PAYMENT
  return wixData.update('payment' , payment).then(async function (updated) {

    if(event.status === 'Successful') {

      if(payment.audition_apply) {

        let apply = await wixData.get('audition_apply' , payment.audition_apply);
        apply.paid = true;

        return wixData.save('audition_apply' , apply).then((saved) => {

          console.log('Audition Apply Paid' , saved);

        });

      } else if(payment.place_rent) {

        let rent = await wixData.get('place_rent' , payment.place_rent);
        rent.paid = true;
        rent.active = true;

        return wixData.save('place_rent' , rent).then((saved) => {

          console.log('Place Rent Paid' , saved);

        })

      } else {

        let pointQueue = {

          title : 'CHARGING POINT',
          members : payment.members,
          value : payment.amount,
          date : new Date(),
          payment : payment._id,
          active : true

        };

        return wixData.save('point' , pointQueue).then((saved) => {

          console.log('Point Charged' , saved);

        })

      }

    } else {
      
      console.log('error' , event.status , payment);
      return null;

    }

  })

}

It works perfect, but I need ‘Refund’
I’m noop to programming but I think what just need is firing ‘Refund’ and then wixPay_onPaymentUpdate will catch event nicely… But I can’t get through it.

Any helps for me? :persevere:

** in Paymentwall said

How can I request a refund?

You can request a refund directly from the seller to whom you made a payment. Refunds are subject to the Paymentwall’s Terms of Service, the website where you made a purchase, the payment method you used, and many other factors. If you feel like you were unfairly denied a refund from the seller, please contact our support team at support@paymentwall.com.

(How can I request a refund? - Support - Paymentwall)