Parse is called on both unsigned and signed transactions to understand the intent of the formulated transaction. This is run as a sanity check before signing (after /construction/payloads) and before broadcast (after /construction/combine).
post
/construction/parse
Body
network_identifierobjectrequired
The network_identifier specifies which network a particular object is associated with.
signedbooleanrequired
Signed is a boolean indicating whether the transaction is signed.
transactionstringrequired
This must be either the unsigned transaction blob returned by /construction/payloads or the signed transaction blob returned by /construction/combine.