A signature authorization letter, in the context of Texas law, allows one individual (the. You can use Form 8822 to notify the Internal.Revenue Service if you changed your home or business mailing address or your business location. You have to tell your credit or debit card company about any error you're disputing within 60 days of when the first statement with the charge was sent to you. You can use Form 8822 to notify the Internal. Revenue Service if you changed your home or business mailing address or your business location. This form should be used when authorizing Blue Cross and Blue Shield of Texas to disclose an individual's Protected Health. Keep a record of who you spoke with and when — then follow up with a letter like the sample below.