Therefore, the following operations can be performed until 31 December 2022: Cancellation of electronic invoices for fiscal years before 2022; Using version 3.3 of CFDI e-invoices (version 4.0 will become mandatory from January 2023, as per the previous update from 15 June); Invoice issuance without an e-signature or digital seal certificate requirement (only for taxpayers under the Simplified Trust Regime); Activation of e-signature (e.firma) by taxpayers under the Simplified Trust Regime; Grace period for taxpayers who still have not enabled their Tax Mailbox or registered/updated their means of contact; Further extension of the transition period for issuing the Carta Porte...