Application of the Secretariat of the São Paulo State Finance to check Tax Coupon and Electronic Invoice Electronic Consumer issued in the State of São Paulo. Through the phone's camera, scan the QR Code printed on the Electronic Tax Receipt Extract to see if it was generated from the data of a SAT equipment regularly registered with the Department of Finance. SAT equipment is new equipment which generates the Fiscal Electronic Coupon and transmits it via the Internet to the Department of Finance, replacing the Tax Coupon paper and fiscal printers. The app also displays the main data of purchase. It can also be used for reading the QR code DANFE Fiscal Electronic Consumer Note, in which case you see all the purchase data. Not to be used for reading other types of QRCode.