Multisig P2WSH (SegWit) Transaction

[ChadW55]

Hello.

How can I create a P2WSH (SegWit) multisig transaction that includes multiple signatures? I found examples for signing SegWit transactions but none of them are multisig. This particular one is for 2/3 multisig wallet and I need to create & sign a transaction using 2 of the private keys. I created the redeem script with txscript.MultiSigScript, calculated the p2wsh (bech32) address and sent funds to it. But I couldn't create & sign a transaction.

        redeemTx := wire.NewMsgTx(wire.TxVersion)

	wifStr1 := "..." //private key
	wif1, err := btcutil.DecodeWIF(wifStr1)
	if err != nil {
		log.Fatal(err)
	}

	wifStr2 := "..." //private key
	wif2, err := btcutil.DecodeWIF(wifStr2)
	if err != nil {
		log.Fatal(err)
	}

	utxoHash, err := chainhash.NewHashFromStr("UTXO hash...")
	if err != nil {
		log.Fatal(err)
	}

	// Index of the UTXO in the previous transaction.
	outPoint := wire.NewOutPoint(utxoHash, 0)
	txIn := wire.NewTxIn(outPoint, nil, nil) // Create an input with empty signature script (for SegWit).
	redeemTx.AddTxIn(txIn)

	decodedAddr, err := btcutil.DecodeAddress("bc1...", &chaincfg.MainNetParams)
	if err != nil {
		log.Fatal(err)
	}
	destinationAddrByte, err := txscript.PayToAddrScript(decodedAddr)
	if err != nil {
		log.Fatal(err)
	}

	redeemTxOut := wire.NewTxOut(9000, destinationAddrByte)
	redeemTx.AddTxOut(redeemTxOut)

	// Ensure the scriptSig is empty (required for SegWit transactions).
	redeemTx.TxIn[0].SignatureScript = nil

	prevOutputFetcher := txscript.NewMultiPrevOutFetcher(nil)
	prevOutputFetcher.AddPrevOut(*outPoint, &wire.TxOut{
		Value:    100000, // The value of the UTXO being spent
		PkScript: redeemScript,
	})

	sigHashes := txscript.NewTxSigHashes(redeemTx, prevOutputFetcher)
	sig1, err := txscript.WitnessSignature(redeemTx, sigHashes, 0, 100000, redeemScript, txscript.SigHashAll, wif1.PrivKey, true)
	if err != nil {
		log.Fatal(err)
	}

	sig2, err := txscript.WitnessSignature(redeemTx, sigHashes, 0, 100000, redeemScript, txscript.SigHashAll, wif2.PrivKey, true)
	if err != nil {
		log.Fatal(err)
	}

	redeemTx.TxIn[0].Witness = wire.TxWitness{} //what next? what to do for multiple signatures?

	// I also tried this code below but I get the error "Witness program hash mismatch" when broadcasting:
	sig1, err := txscript.RawTxInSignature(redeemTx, sigHashes, 0, 100000, redeemScript, txscript.SigHashAll, wif1.PrivKey)
	if err != nil {
		log.Fatal(err)
	}

	sig2, err := txscript.RawTxInSignature(redeemTx, sigHashes, 0, 100000, redeemScript, txscript.SigHashAll, wif2.PrivKey)
	if err != nil {
		log.Fatal(err)
	}

	redeemTx.TxIn[0].Witness = wire.TxWitness{sig1, sig2}