Message payload wrapper

### deserialize(serialised_data): [MessagePayload](#messagepayload)

Turns a serialized message payload string back into its class

| Parameter       | Type |  Description |
| --------------- | -------- | -------- |
| serialised_data | String |   |

### payloadType(): [MessagePayloadType](#messagepayloadtype)

Get the type of message this contains (used to select the correct getter)

### asIndexation(): [IndexationPayload](#indexationpayload)



### asMilestone(): [MilestonePayload](#milestonepayload)



### asTransaction(): [TransactionPayload](#transactionpayload)



### asReceipt(): [ReceiptPayload](#receiptpayload)



### asTreasury(): [TreasuryPayload](#treasurypayload)



### serialize(): String

Serializes the message payload into a json string