We have recently discovered that some Google GCM API keys generated using our instructions before September 30 do not work for push. Using the old instructions, you will get a GCM API key, but will be unable to use it to send push notifications. This is a permanent change on Google’s part, documented at developers.google.com/cloud-messaging/http-server-ref#error-codes. Instructions for dealing with this change are below.
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Developers can extend basic IBM Mobile Web Push by incorporating browser and app events, along with custom audience attributes.Browse docs
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