The sole purpose of this form is to authorize the above named representative to complete the transaction indicated. Authorization Letter.Please complete this printable form online or write legibly in blue or black ink ONLY. Edit, sign, and share authorization letter harris county online. No need to install software, just go to DocHub, and sign up instantly and for free. This Authorization Letter sample is available for use on UpCounsel. Please read all instructions below before completing this form. Please send this request to the issuer from whom you are seeking authorization. Authorization Letter. Please complete this printable form online or write legibly in blue or black ink ONLY.