What billing system are using and are you ready to pay for development of new one ?
I am working at Bulgarian hosting company and we are using Hostbill for last couple of years for billing system, but it has a lot of bugs that we have to fight. Before that we have tried with Blesta and WHMCS, but with the same result. Could you please share what type you are using and if you think is reasonable to try to develop billing system on your own ? Thanks in advance for suggestions and advices !