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About your android sdk error, have a look at https://stackoverflow.com/questions/39760172/you-have-not-accepted-the-license-agreements-of-the-following-sdk-components maybe you will find your solution there (“funny” someone else faced the exact same thing yesterday too License issues: Android SDK Platform 26)
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About
SENDER_ID
, according my Git history I’ve just removed it, nothing else nothing more. And I could confirm that my push notifications are still working. I use like I saidphonegap-plugin-push
>2 (respectively right now 2.1.0). I searched then my SENDER_ID in my all project, I found a reference inpackage.json
(which actually I think is not used) and more important I found a reference ingoogle-services.json
(see https://github.com/phonegap/phonegap-plugin-push/blob/master/docs/INSTALLATION.md).
Are you using phonegap-plugin-push
>2 too? Did you configure this file too?
P.S.: Back in my days I documented the all migration to version 2.0 of the push plugin there Phonegap Push Plugin 2.0.0 released … if that could help