Hello Abisek,
You need to download some marketplace modules:
1. for the qr code: https://marketplace.mendix.com/link/component/112063
2. for the nativer rest implementation https://marketplace.mendix.com/link/component/204760
Further, you need to create different nanoflows and create the http message you want to send, so this will probably involve some domain modelling:
Hope this helps,
Good luck!