Sorry. Newbie here. Would like to ask where or what is that Auth Key? I tried using Web API Key, Google PLIST API_KEY and cloud messaging server keys.
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You need to specify the FCM server/authorization key, see https://stackoverflow.com/questions/37673205/what-is-the-authorization-part-of-the-http-post-request-of-googles-firebase-d and https://stackoverflow.com/questions/37427709/firebase-messaging-where-to-get-server-key – Frank van Puffelen Aug 14 '17 at 15:26
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1I don't know if I need to delete this. Just to reiterate the solution: `Authorization: key=WEB SERVER KEY` – dr.calix Aug 26 '17 at 16:17
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I use "Legacy server key" as Authorization key, which you can find it from firbase console, select your project and Settings->CLOUD MESSAGING(second tab)->Project credentials->Legacy server key – varotariya vajsi Jan 04 '18 at 07:53