### builder(): [TransactionPayloadBuilder](#transactionpayloadbuilder)
Return a new `TransactionPayloadBuilder` to build a `TransactionPayload`.
### essence(): [Essence](#essence)
Return the essence of a `TransactionPayload`.
### id(): [TransactionId](#transactionid)
Computes the identifier of a `TransactionPayload`.
### unlockBlocks(): [UnlockBlock[]](#unlockblock)
Return unlock blocks of a `TransactionPayload`.