What is the source and value for Audience URI mentioned under credentials object when adding SAML 2.0 Identity provider via API to okta?

I am trying to setup Org2Org (Spoke - Hub) in Okta. The API (https://developer.okta.com/docs/reference/api/idps/*add-saml-2-0-identity-provider) for adding IDP (okta spoke) to a SP (okta hub) mentions Audience URI in request under credentials object (https://developer.okta.com/docs/reference/api/idps/*saml-2-0-credentials-object). I need to know that how are we supposed to provide this field’s value.

  • Should the source for this field be IDP or SP?
  • How to get this value from SP/IDP so as to populate the same in the post request for IDP addition?