[Home](./index.md) > [@firebase/messaging](./messaging.md) > [MessagePayload](./messaging.messagepayload.md) ## MessagePayload interface Signature: ```typescript export interface MessagePayload ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [collapseKey](./messaging.messagepayload.collapsekey.md) | string | | | [data?](./messaging.messagepayload.data.md) | { \[key: string\]: string; } | (Optional) | | [fcmOptions?](./messaging.messagepayload.fcmoptions.md) | [FcmOptions](./messaging.fcmoptions.md) | (Optional) | | [from](./messaging.messagepayload.from.md) | string | | | [notification?](./messaging.messagepayload.notification.md) | [NotificationPayload](./messaging.notificationpayload.md) | (Optional) |