Payables API payloads

Summary:

we are using an API call to populate AP in Saas ( ws.make_rest_request(p_url => '/fscmRestApi/resources/latest/invoices'), we need to add few more payloads to it ,like product fiscal classification and product segment, please help us in identifying the same
getting an API error when adding product fiscal classification to the API call

Content (please ensure you mask any confidential information):

na

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

JSON_OBJECT(
'InvoiceNumber' VALUE a.supplier_invoice_number,
'InvoiceCurrency' VALUE 'INR',