Sorry it was nothing I did. I was fortunate to have another account that was coupled with OnePay.
The account I already had that linked up with on its own was with Synchrony Bank.
I don’t know the solution for you. 
Gary
Padyn - I just emailed support@tiller.com and it’s recommended that you do as well, if you’re still needing assistance with this question
The support team has specific instructions and request each person that is interested email them directly so they can explain more details about the process (since there are some important considerations before implementing)
Best of luck!