Is there also an app for merchants?

Unfortunately, there is no app available for merchants. 

But Payconiq has developed the Merchant Portal so that you can track payments as a merchant. This Portal is a secure website that can be accessed from any device with an Internet browser connected to the Internet via https://portal.payconiq.com. You are not limited to any particular device and can view transactions received, when and where you want. You can log into the Merchant Portal using the e-mail address you provided in the Payconiq contract.