post https://{chain}.gateway.tatum.io/construction/preprocess
Preprocess is called prior to /construction/payloads to construct a
request for any metadata that is needed for transaction construction
given (i.e. account nonce).
The options object returned from this endpoint will be sent to the /construction/metadata
endpoint UNMODIFIED by the caller (in an offline execution environment). If
your Construction API implementation has configuration options, they MUST
be specified in the /construction/preprocess request (in the metadata
field).