Buying signal sensors are the receptor mechanisms through which signals are acquired and integrated into tactic deployment, orchestration, and optimization. With a considered design approach standardized across interaction types, this network of sensors and its dynamic signaling capabilities function as an API connecting buyer behavior and buying group context across tactics to sense and respond to the needs of the buying entity in real time. In this report, we explore the network of buying signal sensors that already exists inside the tactic mix, define the core components of signal sensor design, and provide guidance for the design of buying signal sensors.