How to determine the correct Tax Name & Tax Code ID for Category based Purchase Requisition Import?

The interface table PO_REQUISITIONS_INTERFACE_ALL contains the fields TAX_NAME and TAX_CODE_ID. We would like to understand how to determine the correct Tax Name and Tax Code ID for a Category-based or Smart Form Purchase Requisition so that the appropriate values can be passed through the Requisition Import Interface.

Could you please advise:

How are the appropriate TAX_NAME and TAX_CODE_ID values derived for Category-based and Smart Form requisitions?

Is there a standard API, table, or process that should be used to determine these values before populating the interface?

We look forward to your guidance.