The provided information does not directly relate to the company "Madison" with the URL http://www.madisonpos.com and LinkedIn URL http://www.linkedin.com/company/madisonlatam. However, based on general research, a company named Madison might offer services related to point-of-sale systems or similar technology. Without specific details, it's challenging to determine their exact services or target audience. Typically, a unique selling proposition (USP) for such companies would involve innovative technology solutions, customer service, or tailored business solutions. For precise information, more specific details about the company would be needed.