NewFCM creates a new client.

NewFCM creates a new client.

ErrorKey readable error caching.

HeaderRetryAfter HTTP header constant.

MethodPOST indicates http post method.

PriorityHigh used for high notification priority.

PriorityNormal used for normal notification priority.

fcmServerUrl for testing purposes.

FCM stores client with api key to firebase.

Message represents fcm request message.

Notification notification message payload.

Response represents fcm response message - (tokens and topics).

Downstream result from FCM, sent in the "results" field of the Response packet.