Keith, the requirement is to have a "pre-closure" button that will give a preview step with the outstanding principal and interest. An additional option to waive any future interest is required while doing this pre-closure.
Does this need a new API? I can use a combination of existing steps (like viewing outstanding interest, waiving interest, make payment etc.). But even if the UI were to provide a "pre-close" button and call these steps one after the other, it may not happen in a single transaction. Hence, my guess is that a new API will be needed.
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