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Interface representing an FCM legacy API data message payload. Data messages let developers send up to 4KB of custom key-value pairs. The keys and values must both be strings. Keys can be any custom string, except for the following reserved strings:

  • "from"
  • Anything starting with "google.".

See Build send requests for code samples and detailed documentation.

Indexable

[key: string]: string

Interface representing an FCM legacy API data message payload. Data messages let developers send up to 4KB of custom key-value pairs. The keys and values must both be strings. Keys can be any custom string, except for the following reserved strings:

  • "from"
  • Anything starting with "google.".

See Build send requests for code samples and detailed documentation.