A2Billing Integration

We are looking for someone that can integrate an old copy of A2Billing with a new one that is currently running. Customers have been manually migrated from old DB to new.. so they need to be susbsequently merged along with CDR records so all CDR can be billed (2yrs outstanding). We also need custom invoice setup along with proper billing for credit card and paypal. We should be able to setup customers properly with customer information and payment information so customers can be autobilled. SOW attached