Hi Sir,
We are a team of 4 members having 4+ years of experience in magento and wordpress customization, hope we will get this job done in timely manner with 100% Quality.
This job is nothing but including a parameter in URL. There is nothing issue in your site. Need to do settings in your server to include the parameter in URL.
Though we are new to freelance, we have enough experience in handling high level customization, since we deal with different magento requirements in our day to day activities.
Since we are looking for long term business, we are ready to do this work as sample to prove ourselves.
Thanks,
Manoj