A copy of the registered owner's valid U.S. State issued Driver License or Personal Identification Card or Federal Identification is required. Authorization Letter.Please complete this printable form online or write legibly in blue or black ink ONLY. 1 revised: February 11, 2020. 832-394-8888. A Letter of Authorization (LOA) must contain the following information: Letter must be on company letterhead. Letter of Authorization. Applicant Information. A parent can sign an "authorization agreement" form to give a nonparent the authority to care for and make decisions for a child. Authorization to fill in and submit any application or other information. Applicant Information.