To ensure a good user experience, you must thoroughly test your app before launching MobilePay. All information related to test is gathered here. We recommend that you read the information on the site and go through the test cases.
However, it is possible to use the test merchant ids to simulate a payment flow without doing any real payments.
The test merchant ids are APPDK0000000000 for Danish version of MobilePay and APPFI0000000000 for Finnish version of MobilePay.