Hello! I have moved your topic from Off-topic to our help forum.
And to answer your question...Payment methods allowed: IMVU credits, Paypal, and deviantART points
You may use IMVU credits, Paypal, and deviantART points as methods of payment. However, please be clear on what the artist accepts as payment methods.
From: Art Shop Rules
Bpay (from my just glancing) appears to primarily be used for paying bills. It looks like it is supported by using a "biller's code" of which I have never seen on this forum, so I can fairly safely assume that few use it. If you are looking to pay money for customs, Paypal is the much more popular method due to its reliability, ease of use, and safety.