XML Export function for OSCommerce

This project is a small (prototype) project for making a connection from OSCommerce to an online bookkeeping website. I would like to have an export function in OSCommerce where I can select a date range and export all orders for a certain period with a certain status. This will be exported to an xml file / string and will be posted to the webservice of this website. I would also like to have some advise about setting the different tax rates into oscommerce. Some export clients and countries have 0% rate and this should also be exported this way. I'm not sure anything else should be changed in OSCommerce to work properly with this? I'm looking for someone who is experienced with OSCommerce and speaks english well! ## Deliverables The objective of this project is to get sales orders imported into the online bookkeeping program.