Integration with Quickbooks

We have a relational legal case management application which, among many other things, tracks time and cost information for individual cases. We need an interface written so that our application can automatically integrate with Quickbooks Pro 2007. Cost Entries in our application flagged as "check requests" in our application need to be copied over into Quickbooks as "bills to be paid". Once those bills are paid in QuickBooks, the specific payment information (e.g. check number and payment date) needs to be copied back into the appropriate cost records in our application. Our application is written in Delphi 7 using the Advantage Database Server engine. We require full ownership of the source code for this project. We are seeking skilled developers with whom to build long-term relationships for additional overflow work and special projects. This project is our test-run for this contract model. If it is successful there will be many more projects. Serious Bidders only. thanks!