Function listsendpays_done

plugins/fetchinvoice.c:1455–1532

They're offering a refund, so we need to sign with same key as used * in initial payment. */

/* They're offering a refund, so we need to sign with same key as used
 * in initial payment. */
static struct command_result *listsendpays_done(struct command *cmd,
						const char *buf,
						const jsmntok_t *result,
						struct sent *sent)
{
	const jsmntok_t *t, *arr = json_get_member(buf, result, "payments");
	size_t i;
	const u8 *public_tweak = NULL, *p;
	u8 *msg;
	size_t len;
	struct sha256 merkle;
	struct out_req *req;

	/* Linearize populates ->fields */
	msg = tal_arr(tmpctx, u8, 0);
	towire_tlv_invoice(&msg, sent->inv);
	p = msg;
	len = tal_bytelen(msg);
	sent->inv = fromwire_tlv_invoice(cmd, &p, &len);
	if (!sent->inv)
		plugin_err(cmd->plugin,
			   "Could not remarshall %s", tal_hex(tmpctx, msg));

	merkle_tlv(sent->inv->fields, &merkle);

	json_for_each_arr(i, t, arr) {
		const jsmntok_t *b12tok;
		struct tlv_invoice *inv;
		char *fail;

		b12tok = json_get_member(buf, t, "bolt12");
		if (!b12tok) {
			/* This could happen if they try to refund a bolt11 */
			plugin_log(cmd->plugin, LOG_UNUSUAL,
				   "Not bolt12 string in %.*s?",
				   json_tok_full_len(t),
				   json_tok_full(buf, t));
			continue;
		}

		inv = invoice_decode(tmpctx, buf + b12tok->start,
				     b12tok->end - b12tok->start,
				     plugin_feature_set(cmd->plugin),
				     chainparams,
				     &fail);
		if (!inv) {
			plugin_log(cmd->plugin, LOG_BROKEN,
				   "Bad bolt12 string in %.*s?",
				   json_tok_full_len(t),
				   json_tok_full(buf, t));
			continue;
		}

		public_tweak = inv->payer_info;
		break;
	}

	if (!public_tweak)