Method psbtbumpfee undefined ()
connect with JSON-RPC protocol

Bumps the fee of an opt-in-RBF transaction T, replacing it with a newtransaction B.Returns a PSBT instead of creating and signing a new transaction.An opt-in RBF transaction with the given txid must be in the wallet.The command will pay the additional fee by reducing change outputs oradding inputs when necessary.It may add a new change output if one does not already exist.All inputs in the original transaction will be included in thereplacement transaction.The command will fail if the wallet or mempool contains a transactionthat spends one of T’s outputs.By default, the new fee will be calculated automatically using theestimatesmartfee RPC.The user can specify a confirmation target for estimatesmartfee.Alternatively, the user can specify a fee rate in sat/vB for the newtransaction.At a minimum, the new fee rate must be high enough to pay an additionalnew relay fee (incrementalfee returned by getnetworkinfo) to enter thenode’s mempool.