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PulseAll requests made against the Pulse API must be validated with an API Key. Generate a new API Key in your Pulse account and copy/paste it when you add the sensors on vpdchart.com.
If you consider buying one of these sensors, use the code VPDCHARTDOTCOM at checkout and get 5% discount.
UbiBotYou need to have an account at https://console.ubibot.com/. Create a "Read API Key" for a sensor, copy it on vpdchart.com together with the "Channel ID", when you add the sensor and you're good to go.
All HTTP requests made against the Ecowitt API must be validated with an Application Key and API Key. Check Ecowitt API Docs