Do you know how I could add an ESDT or NFT transfer to this?

Well there are interactions.... Or you again use the transaction payload builders :) const payload = TransactionPayload.contractCall() .setFunction(new ContractFunction("ESDTNFTTransfer")) .setArgs([ BytesValue.fromUTF8(this.config.nftTokenIdentifier), new U64Value(nonce), new BigUIntValue(new BigNumber(1)), new AddressValue(this.receiver), BytesValue.fromUTF8("yourFunctionName"), new List(new ListType(new U64Type()), [new U64Value(1),new U64Value(2),new U64Value(3)]) ]) .build(); return new Transaction({ receiver: sender, gasLimit: new GasLimit(5000000), data: payload, });