Please refer to your contract for the fees for using your USS Partnershop.
Costs only accrue when you receive orders. In case an order is produced by Unitedprint, you will be charged the listed price (minus your personal discount). When you are producing the order yourself, you will be charged a commission fee.
The Payment Service Provider Worldline will charge fees in case your customers chose to use online payment methods. Worldline’s terms can be viewed at any time in your Worldline backend.
Note
Non-EURO accounts (for example, CHF, GBP, etc.) may result in differential amounts within Worldline settlements. These are customary foreign bank fees. As a payment provider, Worldline has no influence whatsoever.
In order to keep this amount as small as possible, Worldline can for you as a Partner can switch the payout period from weekly to monthly.
Another option would be to create a EURO account and pay out in EUR.