Credit card authorizations can be valid for as long as you need them, but there are some key things to keep in mind:Firstly, keeping signed authorization forms for two to three months after you stop charging the card. This helps in case there are any disputes or chargebacks.When storing the forms, store physical ones in a locked room or filing cabinet. Only let employees who need them for their job access these forms. For digital forms, be sure to use a secure, encrypted client portal or a secure file transfer app.Following these steps helps you stay PCI compliant.