In order to make a bank authorization letter, it's important to empower someone with bank relates issues, for example in taking collecting or sign on documents. Authorization letters are formal letters that empower somebody else to take actions on your behalf.Edit, sign, and share sample letter authorization form online. No need to install software, just go to DocHub, and sign up instantly and for free. An alphabeticalbytopic list is provided below containing information and downloadable PDF forms, when available, or links to external resources. 1. Look into granting financial power of attorney for limited transactions. Fax: (210) 924-4104. Mail: Pre-Application Platting Guidelines. Fill out the application and gather your required documents. 2. Law, such as Tarrant Bank v.