Complete your Master Promissory Note (MPN) to acknowledge that you understand the terms and conditions of your federal student loans. This document restates the basic information included in the Promissory Note, as well as explains your responsibilities and rights as a borrower. The.The financial aid office at your college or career school will tell you how you need to complete and sign your MPN. Such a document serves as the borrower's proof that the debt has been paid. A promissory note is a legal document between the borrower and lender for full mortgage repayment. Learn how promissory notes work and what is included. Note: Borrowers have the right to complete and sign a paper MPN. A promissory note contains important information on the terms of your loan.