To test QRIS payments on sandbox mode, you can download and use the following apps to perform payment simulations. If the QRIS payment channel is not yet available in the sandbox payment option, you can email an opening request to support@duitku.com.
https://drive.google.com/drive/u/3/folders/1A3ccngXOemRZCXGk1cvfm82ybfpn6vhb