Check at the panel of Payoom. On very Left side you will see a button for Deeplinking. Click and there you will be able to create the link. PFA
Now Lets take an example: If you want to create a deepurl for below link:
Just select the basicslife from the Select an offer dropdown list.
Now Paste the url link which i mentioned above in the add a website.
Now if you want to add subid then you can add else no need to add. then Click the Add.
Let me know if you need any further help regarding this.