What is the validity of the Digital Signature certificate?

We must break down the two existing processes:

1. Signature renewal under autencicacao.gov.pt
   The Subscription must be renewed every 2 years. The first 2 years are free, and there is a payment of 40€ to the State for each subsequent renewal.
2. Authorization renewal for InvoiceXpress to use your Signature
   This process is already done within our application and must be carried out every 45 days. This allows you to renew your consent to search for your Subscription and thus keep track of your personal data. 3 days before each authorization renewal process, we will send you an email alert regarding the need to renew this authorization.