Calculate a preview of loan terms (payment amounts, fees, etc.) for a given program without creating an application or offer.

    This is a dry-run calculation that uses Canopy's amortization API to ensure the
    calculated values match what would actually be charged if the loan were originated.

    **Request parameters:**
    - `requested_loan_amount` (required): The principal amount to calculate terms for
    - `requested_loan_term_days` (optional): Term in days. Defaults to program's max_term_days
    - `requested_apr` (optional): APR to use. Defaults to program's max_apr

    All requested values must be within the program's configured bounds.