createpsbt [{"txid":"id","vout":n},...] [{"address":amount},{"data":"hex"},...] ( locktime ) ( replaceable )

Creates a transaction in the Partially Signed Transaction format.
Implements the Creator role.

1. "inputs" (array, required) A json array of json objects
"txid":"id", (string, required) The transaction id
"vout":n, (numeric, required) The output number
"sequence":n (numeric, optional) The sequence number
2. "outputs" (array, required) a json array with outputs (key-value pairs)
"address":, (obj, optional) A key-value pair. The key (string) is the bitcoin address, the value (float or string) is the amount in " + CURRENCY_UNIT + "
"data": "hex" (obj, optional) A key-value pair. The key must be "data", the value is hex encoded data
,... More key-value pairs of the above form. For compatibility reasons, a dictionary, which holds the key-value pairs directly, is also
accepted as second parameter.
3. locktime (numeric, optional, default=0) Raw locktime. Non-0 value also locktime-activates inputs
4. replaceable (boolean, optional, default=false) Marks this transaction as BIP125 replaceable.
Allows this transaction to be replaced by a transaction with higher fees. If provided, it is an error if explicit sequence numbers are incompatible.

"psbt" (string) The resulting raw transaction (base64-encoded string)

> bitcoin-cli createpsbt "[{\\"txid\\":\\"myid\\",\\"vout\\":0}]" "[{\\"data\\":\\"00010203\\"}]"
Don't trust. Verify. Docs extracted from src/rpc/rawtransaction.cpp#L1675-L1710.