Update to Play.com API product upload script

We have a script which uploads products from a source file, which includes a SKU, barcode, price and quantity. They are uploading to the [login to view URL] website using their API. We would like to be able to create a text file which allows us to replace certain barcodes with play IDs, or other barcodes, using the SKU as a reference. So the text file will have three columns, SKU as the main reference, PlayID as column 2 and barcode as column 3. There will be either PlayID or barcode for each SKU, which is then to be replaced in the output file. e.g: Sku Barcode PlayID SKU1 68765156768454 Would output barcode 68765156768454 instead of what ever may be in the source file. The Play API needs the productID type to be changed to either 3 Barcode or 1 PlayID. We have this functionality added to another of our [login to view URL] scripts if you would like to check it and update it onto the current script. Thanks