Pay your attention to the following processing
CCBill, ACpay and Jettis have good support and they pay on time and weekly.
If you need merchant account you need Netbilling indeed.
I don't care for IBill and Verotel who have had technical problems and don't pay on time. Verotel my debtor for 50k.
Some words about WSB, he has some problems with paying currently but I hope it's temporally.
Mark