Securely Passing Logged-in User Credentials to AP Creation API in VBCS

Dear Team,

I have developed a custom portal in Oracle Visual Builder Cloud Service (VBCS) to allow users to enter invoices on behalf of branch users. Once an invoice is entered, it is routed for approval by a department user. Upon approval, the invoice is created in Oracle Fusion using the AP Creation seeded API. My requirement is to invoke the API with the logged-in user credentials from the portal. Specifically, the "Created By" field in Oracle Fusion needs to reflect the logged-in user from the portal. In order to invoke the API, we need to provide both the username and the