Thank you for your question.
Well done on setting things up in your wallee and Shopify shop. Depending if you are testing in a test environment or live environment, your credentials from BSPAYONE will differ. I'm not quite sure what you mean with if it works in Switzerland, Germany and Austria; but if you have the different currencies activated in your contract with BSPAYONE in combination with the payment type, you should be able to accept payments in all three countries. If however, these are not activated in your contract, you may receive error messages in your wallee.
If you would like us to look at your case speficially, please email us at firstname.lastname@example.org and one of our support team members will happily help you!