What are the equivalent NPM packages

Hi Team,

I was  trying to convert existing web service (asmx) code to ASP.NET Core  WEB API and found below issues:

Issue 1: I was trying to add NPM packages for the below but not able to find/add NPM for the below dlls. Can you please help me to identify the NPM packages for the below dlls.

System.Data
system.data.linq
System.Data.Linq.Mapping
System.Xml
Added System.Xml.Serialization but its doesn't recognise SoapElementAttribute,SoapTypeAttribute like this many...

Some of the other dlls also I need NPM for these.

PayPalCoreSDK

PayPalMerchantSDK

AuthorizationAPI

CyberSource

Interop.STANDARDOPCLIENTLib

Thanks....