If you want to quickly download the latest e.firma certificate, you have to follow the following steps:
Have your RFC or the certificate serial number.
Click this link to run online.
Enter the captcha code that appears on the screen.
Choose whether you want to recover your certificate by entering the RFC or serial number (I recommend using the first option).
Select the certificate you want to download by selecting the serial number.
When is the electronic signature submitted to the SAT?
You must submit your SAT electronic signature canada phone data online whenever you need to make an update to your e.signature file, resulting from the update of your RFC activities or due to any adjustment to your personal information.
How long is the SAT electronic signature (now e.firma) valid for?
Your e.signature is valid for four years. Once this period has elapsed, you must request a renewal of the certificate. This process is completely free and you can do it online or in person at any of the SAT offices.
How to renew the SAT electronic signature?
Once your e.signature certificate – previously known as SAT electronic signature – has expired, you must follow the following process at any time and up to 24 hours before its expiration.
Renew your e.signature online
Renew electronic signature SAT
Generate your renewal requirement file (.ren) at this link .
Click on this link to start the renewal process.
Log in with your current e.signature.
Select the “Certificate Renewal” option.
Select the browse option to upload the previously generated renewal requirement (.ren) file.
Click on the “Renew” option, write down the transaction number in a safe place and choose the “Tracking” option.
Save and print the receipt for your digital certificate renewal process by clicking on the “Receipt” button.
Press the “Back” button and go to the “Certificate Recovery” section.
Choose the “Certificate Recovery” option, enter your RFC and click “Search”.
Select the serial number of your active electronic signature certificate and save it in the same folder where you have your Renewal Request and private key files.