private fun ScriptHash.wallet_reserveFunds(expiry: BigInteger, value: BigInteger, recipient: ScriptHash): Unit (source)
Reserves funds in a previously validated user wallet. Overwrites any existing fund reservations.
Note: Please ensure that the wallet has been validated before this is called.
expiry - timestamp of when the reserved funds get released automatically
value - the amount of GAS to hold in the reservation as a fixed8 int
recipient - the recipient script hash that the funds are reserved for (set to owner if not known yet)
Return
true on success