The SAT has a service for verifying digital tax receipts through the Internet. Remember that when you use the services of an Authorized Provider of Digital Tax Receipts (PAC), the stamp of your CFDI constitutes the SAT’S legal acknowledgement of such transaction.
To consult the SAT’S CFDI Verification service, enter:
Do not forget that PACs immediately send a copy to the SAT of all CFDIs certified/stamped by them by legal order. However, it is sometimes necessary to wait 72 hours after a CFDI has been certified/stamped for such receipt to appear reflected in the SAT’S CFDI verification service.