Invoices for customers from India are digitally signed to confirm the validity of the invoice. You should see a message “Signature Valid” and a green checkmark in your invoice.

How to validate a digital signature

If you are seeing the message "Signature Not Valid" and a yellow question mark, try the following steps to validate the invoice:

1.  Download the invoice. 
2.  After downloading the invoice, open the invoice in Adobe Acrobat Reader.
   You should see the Signature Valid message and a green checkmark to confirm the validation of the digital signature.
3. If you are still unable to see the Signature Valid message, please update your Adobe settings:
   1. In Adobe Acrobat reader, open Menu, then Preferences, then Signatures, then Verification, then More.
   2. Uncheck the box Require certificate revocation checking to succeed whenever possible during signature verification. 
   3.  Click on OK and then again on OK.
      The setting should be updated now.
   4. Once the settings are updated, you should see the Signature Valid message and a green checkmark to confirm the validation of the digital signature. If not, try to click on the signature to validate it again.

Note: Applications such as Apple’s Preview or PDF viewers built in to your web browser cannot be used to validate a signature.