Customer Credit Card refund not working

Issue of Customer credit card not working.
We can refund to customer’s credit card when the purchase is done online. But when we try to refund an error displays with following message.

Requirement 
1)The client should be able to refund the credit card orders placed online from Netsuite.

Our Solution

Prior to 2021.1, although Credit Operation is separate in the Payment Processing Profile, the Credit Operation itself in a transaction is not truly recognized in the Payment Event and still tagged as a Refund Operation. In 2021.1 Credit Operation is now its own process.

Under the Refund Method tab > Payment Events subtab, the Event column will now show Refund when a P/N Ref. is provided and Credit if no P/N Ref. is provided.
2 ways to resolve the issue:

Option 1:

1. Copy the P/N Ref. under the Payment Events subtab from the Cash Sale/Customer Deposit/Customer Payment you want to refund before saving the Customer Refund. This P/N Ref. from a payment made outside of NetSuite can also be used.
2. Paste this number in the P/N Ref. field under the Refund Method tab > Payments subtab when creating the refund

3. Click Save


Option 2: Enable Credit Request Type

Using Admin role:

A. Show Internals IDs:

1. Navigate to Home > Set Preferences
   1. Under the General tab, Defaults section, enable Show Internal IDs
   2. Click Save
2. B. Enable Credit Request Type
   1. Navigate to Setup > Accounting > Payment Processing Profiles
   2. Edit the Payment Processing Profile with the internal ID mentioned in the error message
   3. Under Gateway Request Types, select Credit

d. Click Save
3.C. Create the Refund as Usual

1. In the Refund Method tab > Payments subtab, the P/N Ref. field can be left blank
   For the use of first method we have to get the P/N Ref method and fill it during the refund time.For second solution when try to do this there was no credit Under Gateway Request Types.
   
   Note:We can suggest the first method.As a method to solve this.