Why do you not want to answer this thread?(Your answer will be sent to Jeanette and Aytekin)
I'd like to offer customers the choice.
Unfortunately no. You cannot have 2 Payment field on the same form.
You will have to use workaround similar to what was described on this user guide:
User guide: -How-to-Create-a-Basic-Multiple-Payment-form
Here is a demo form : https://form.jotformpro.com/70983924622968