Read the statement by Michael Teeuw here.
MMM-GoogleMapsTraffic: "For Development purposes only"
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 Hello, everyone, I inserted the GoogleMaps map, it works too. A valid API is used for all functions as well as a billing account. 
 The map is displayed normally at first, followed by an error message that the page could not be loaded correctly. I can confirm this but still have the message in the card that turns slightly greyish “For Development purposes only”
 What is wrong? My Config is:{ module: 'MMM-GoogleMapsTraffic', position: 'bottom_right', config: { apiKey: 'My Key' , lat: 49.56324, lng: 11.34776, styleMapType: "dark", disableDefaultUI: true, backgroundColor: "rgba(0, 0, 0, 0)", updateInterval: 15000, height: '450px', width: '450px' } },Thanks for help. Best regards Fufu1408 
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 @fufu1408 yep, one little typo will do that to you… I tested and see the same results, used the dev window and see the error, 
 checked the module and sure enough…i’ll give u a hint… what is the spelling of the apikey parameter? 
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 @fufu1408 u are updating every 15 seconds? 15000 milliseconds… I would say a MINIMUM of 5 minutes 5 * 60 * 1000 but 10 or 15 mins might be better 
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 @sdetweil i change the updating thanks. but same problem with the development purposes only 
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 @fufu1408 yep, one little typo will do that to you… I tested and see the same results, used the dev window and see the error, 
 checked the module and sure enough…i’ll give u a hint… what is the spelling of the apikey parameter? 
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 it’s key: 
 not apikey:
