ASTPP & FusionPBX expert

Hello, I am considering to adopt new deployment using ASTPP for billing to be integrated with FusionPBX utilizing the multi tenant IPPBX typically ASTPP will handle the billing aspects for voip termination and DIDs origination (we currently use IDT Express and [login to view URL] ) then map it conveniently to the PBX tenant I will surely avail both cloud VMs with the base OS as per you recommendations most likely will be Debian as per the documentation or of you want me to setup boh ASTPP and FusionPBX beforehand that would be ok too and then you will just help me onboarding with the initial setup, configuration, interconnection and integration between both VMs and between ASTPP with both [login to view URL] and IDT to be acquainted with the full picture and end to end cycle. please note that I already have ASTPP server up and running but using version 4 yet I am looking forward now to use the latest version 5 .. I have good background in this scope so your job and delivery experience would be joyful and easy (I hope ?) Now how much would I expect to pay for your service? Thanks in advance.. cheers