BillEase accepts payments through different channels. I send mine through BPI.
Why? Because I have an online account. Thus, I can transfer money to them anytime.
What I do is I email them first to confirm their account number. You can shoot them an email at pay at billease dot ph or info at billease dot ph. I prefer the latter!
Once confirmed, I send them money which they are able to verify within the day. That’s if I sent the details as early as I can.
To notify them with my payment, I email them a screenshot of the transaction.
P.S. BillEase increased my credit limit recently. Check this post.