Please refer to the http://www.hcch.net/upload/abc12e.pdf - Question 13 and you'll see it's not a legal reason of denying an apostile the fact that it's not issued in a certain country.
This information is from an official site, the authority that handles apostiles worldwide.
Contact Maysus. Maysus is a license payment processor. I guess they are related somehow with OKPAY but this thing it doesn't matter.
Why should you contact Maysus? Because OKPAY is registered in BVI(according to their website) and they are not regulated by anybody.Okpay is a normal company(not licensed). It will be very hard for you to get a court order in BVI and even so...there are almost zero changes to know their bank account.
Also, all the OKPAY funds are with Maysus. They are their "banker"(if I can say so). Maysus is their payment processor so try to approch Maysus again. Call them.
Explain them the situation. If you cannot find understanding, then go ahead with the BVI court order.