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52107: Invalid custom key for GCM/FCM

ERROR: 52107

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NOTIFICATIONS
ERROR

Error - 52107

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Invalid custom key for GCM/FCM

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Possible Causes

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  • You have specified an invalid key in the custom key-value pair section of the payload.

Possible Solutions

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  • GCM/FCM rejects some keys including from, gcm and anything prefixed by google. Make sure you are not using any of these keys.