Can I use existing Stripe account instead of Heartland payment account with the UPT? No, you cannot use an existing Stripe account with the UPT. Related articles How can I place an order to ship outside of the US? What amperage rating should my electrical breaker be? Unattended Payment Terminal (UPT) UPT shows “E09 - Failed to get end point. Check the network and the APN” error message on the screen. Can I start using charging functions with UPT without having a Heartland account?