This parameter specifies the custom key-value pairs of the
message's payload.
For example, with data:{"score":"3x1"}:
On iOS, if the message is sent via APNS, it represents the
custom data fields. If it is sent via FCM connection server,
it would be represented as key value dictionary in AppDelegate
application:didReceiveRemoteNotification:.
On Android, this would result in an intent extra named score
with the string value 3x1.
The key should not be a reserved word ("from" or any word
starting with "google" or "gcm"). Do not use any of the words
defined in this table (such as collapse_key).
Values in string types are recommended. You have to convert
values in objects or other non-string data types (e.g.,
integers or booleans) to string.
This parameter specifies the custom key-value pairs of the message's payload.
For example, with data:{"score":"3x1"}:
On iOS, if the message is sent via APNS, it represents the custom data fields. If it is sent via FCM connection server, it would be represented as key value dictionary in AppDelegate application:didReceiveRemoteNotification:.
On Android, this would result in an intent extra named score with the string value 3x1.
The key should not be a reserved word ("from" or any word starting with "google" or "gcm"). Do not use any of the words defined in this table (such as collapse_key).
Values in string types are recommended. You have to convert values in objects or other non-string data types (e.g., integers or booleans) to string.