Any updates with your Shared Data plans to another customer who is with another CSP?
Online Rating will be a real challenge as the business rules will be very complicated along with the BSS (Business Support System) processes that will be required for for inter-CSP(s) co-operation.
Possible as an off-line postpaid solution. Will require BSS / Business Processes (eTOM) to be overhauled.
Let me know where you are with your investigation.
VBR/ Wallis Dudhnath