Withings heart API
Returns ECG (EKG) signal points in micro-volt (μV). You can use the [Heart - List](#operation/heartv2-list) service to get the list of ECG records and their corresponding ```signalid``` and then use [Heart - Get](#operation/heartv2-get) to get the signal details. The data are only available once a synchronization occured between the device and Withings servers (which might include synchronizing with Withings mobile application or via Withings Mobile SDK).