Small WHMCS integration

Need an experienced WHMCS developer for some small addition to our project - need to match clients and products with our accounting software's id's. It is important to do this without something braking when upgrading WHMCS , developer should be able to recommend best way to do this , our original idea is a small add-on/plugin or related that will importing WHMCS customer and product id on a new db and an edit/add buttom to insert our corresponding accounting id , along with the functionality to export reports that will be showing those id's - all accessible within WHMCS admin area. should be a really basic task for an experienced WHMCS developer taking no more than few hours (along with testing etc). We really need quality work , the chosen developer may not have to be on the low end of offers.