Include the full legal name of the authorized party and their relationship to the account holder. Account Holder Signature(s):.Banks aren't interested in reading your letters. This letter should be short and simple. Fill out and submit the form according to your bank's instructions. Advertisement. The letter authorizes Carl Patrick V. Cagampang to encash a check worth P60,626.54 on behalf of Pauline Erika V. Cagampang and Margie V. Cagampang. I regret to inform you that I could not collect the loan documents from the bank manager this week as I had a family emergency.