Modify/Customise existing WordPress Plugin

Hi, I have purchased the WordPress plugin Affiliate Egg and i require customisation to the existing plugin. The plugin zip has been attached. If you have no idea what is the affiliate egg plugin about please look at the youtube link for more information:[login to view URL] Basically this Affiliate Egg plugin already supports several affiliate stores out of the box such as [login to view URL] and www.groupon.com. The modification that i require is to create a "Custom parsers" to support the affiliate store groupon.sg. There are instructions in the Affiliate Egg's plugin manual on how to create "Custom parsers" to support new affiliate stores. Please see page 14 and 15 of the PDF Manual. Link: [login to view URL] You need to have php and xpath skills for this custom job. For this customisation, i will need for "Custom parsers" to be created for the affiliate store groupon.sg. - So, after the WordPress installation, go to menu > Affiliate Egg > Add Store front. - I will be able to add (1) URL of single product page from [login to view URL] (2) Or Page with list of products/ Main Category Page. Once you have completed the customisation, you are required to show me the screenshot that it works and send me the codes to test. You will not be given test WordPress website accounts. You will need to setup this plugin in your own test website environment. Please let me know if there is anything that you are unclear of. Or need additional clarifications. Let me know if you can take up this job. And when can you complete this job by?