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? How much time is required to remove the “E06 - null or duplicate provisioning” error message shown on the UPT screen? Can I start using charging functions with UPT without having a Heartland account? How to pass through the “E06 - null or duplicate provisioning” error message shown on the UPT screen?