Apostille Texas can same day apostille authorization letters at the Texas Secretary of State for you or your company. Please review the instructions listed on our Request an Apostille page.We can apostille an authorization letter signed and notarized in all 50 US states, District of Columbia, and the US Federal Government (USA Embassy). Below is an example of the State of Texas Apostille. To obtain a Texas apostille, first identify your document type and understand its requirements. Need to see an example of a US apostille? Visit our site for the most up to date list of US apostilles. A notarized document is one which has been denoted with a stamp (or seal), indicating the signature on the document is legitimate. We only need three things from you to complete the expedited Texas apostille EIN confirmation number letter copy process. In Texas, the Texas Secretary of State is the authority that issues apostilles.