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Interface representing an FCM legacy API notification message payload. Notification messages let developers send up to 4KB of predefined key-value pairs. Accepted keys are outlined below.

See Build send requests for code samples and detailed documentation.

Indexable

[key: string]: string | undefined

Interface representing an FCM legacy API notification message payload. Notification messages let developers send up to 4KB of predefined key-value pairs. Accepted keys are outlined below.

See Build send requests for code samples and detailed documentation.