Systems and methods for operating a security tag of an Electronic Article Surveillance (“EAS”) system. The methods involve providing a unique identifier from the security tag to an application installed on a mobile communication device via a first short-range communication when the security tag is attached to an article for sale. A second short-range communication is received by the security tag from the mobile communication device that comprises a detachment command. The detachment command is received by the security tag exclusively after the article has been successfully purchased. Thereafter, the security tag verifies that the second short-range communication is intended to be processed thereby. Next, the security tag performs operations to actuate a detachment mechanism in response to the detachment command so that the security tag can be detached from the article for sale.