breez-sdk-docs/snippets/dart_snippets/lib/send_spontaneous_payment.dart

import 'package:breez_sdk/breez_sdk.dart';
import 'package:breez_sdk/bridge_generated.dart';
import 'dart:convert';

Future<SendPaymentResponse> sendSpontaneousPayment({
  required String nodeId,
}) async {
  // ANCHOR: send-spontaneous-payment
  SendSpontaneousPaymentRequest req = SendSpontaneousPaymentRequest(
    amountMsat: 3000000,
    nodeId: nodeId,
  );
  SendPaymentResponse resp = await BreezSDK().sendSpontaneousPayment(req: req);
  // ANCHOR_END: send-spontaneous-payment
  return resp;
}

Future<SendPaymentResponse> sendSpontaneousPaymentWithTlvs({
  required String nodeId,
}) async {
  // ANCHOR: send-spontaneous-payment-with-tlvs
  List<TlvEntry> extraTlvs = [
    TlvEntry(
      fieldNumber: 34349334, 
      value: utf8.encode("Hello world!"),
    )
  ];
  SendSpontaneousPaymentRequest req = SendSpontaneousPaymentRequest(
    amountMsat: 3000000,
    nodeId: nodeId,
    extraTlvs: extraTlvs,
  );
  SendPaymentResponse resp = await BreezSDK().sendSpontaneousPayment(req: req);
  // ANCHOR_END: send-spontaneous-payment-with-tlvs
  return resp;
}