Payloads is called with an array of operations
and the response from /construction/metadata. It returns an
unsigned transaction blob and a collection of payloads that must
be signed by particular AccountIdentifiers using a certain SignatureType.

The array of operations provided in transaction construction often times
can not specify all "effects" of a transaction (consider invoked transactions
in Ethereum). However, they can deterministically specify the "intent"
of the transaction, which is sufficient for construction. For this reason,
parsing the corresponding transaction in the Data API (when it lands on chain)
will contain a superset of whatever operations were provided during construction.