2 ways to send a Discord voice message using a bot token

voice-message-1.mjs

import { readFileSync, statSync } from "fs";
import { getAudioDurationInSeconds } from "get-audio-duration";

const botToken = "Njc1NTM5NTEyOTEwMTUxNjkx.GCAq4j.VaRQAFI6hBrgvcVPi_wY4zCzT4G-2D60h5mw7g",
	channelID = "732171142344736818",
	audioPath = "path/to/audio/file";

const body = new FormData();

body.append("files[0]", new Blob([readFileSync(audioPath)]), "voice-message.ogg");

body.append(
	"payload_json",
	JSON.stringify({
		attachments: [
			{
				id: "0",
				filename: "voice-message.ogg",
				duration_secs: await getAudioDurationInSeconds(audioPath),
				waveform: ""
			}
		],
		flags: 1 << 13 // Voice message flag
	})
);

// Send the voice message
await fetch(`https://discord.com/api/v10/channels/${channelID}/messages`, {
	method: "POST",
	headers: { authorization: `Bot ${botToken}` },
	body
});

voice-message-2.mjs

import { readFileSync, statSync } from "fs";
import { getAudioDurationInSeconds } from "get-audio-duration";

const botToken = "Njc1NTM5NTEyOTEwMTUxNjkx.GCAq4j.VaRQAFI6hBrgvcVPi_wY4zCzT4G-2D60h5mw7g",
	channelID = "732171142344736818",
	audioPath = "path/to/audio/file";

// Create an attachment for uploading
const {
	attachments: [{ upload_url, upload_filename }]
} = await (
	await fetch(`https://discord.com/api/v10/channels/${channelID}/attachments`, {
		method: "POST",
		headers: {
			"content-type": "application/json",
			authorization: `Bot ${botToken}`
		},
		body: JSON.stringify({
			files: [
				{
					id: "42069",
					filename: "voice-message.ogg",
					file_size: statSync(audioPath).size
				}
			]
		})
	})
).json();

// Upload our file
await fetch(upload_url, { method: "PUT", body: readFileSync(audioPath) });

// Send the voice message
await fetch(`https://discord.com/api/v10/channels/${channelID}/messages`, {
	method: "POST",
	headers: {
		"content-type": "application/json",
		authorization: `Bot ${botToken}`
	},
	body: JSON.stringify({
		attachments: [
			{
				id: "72786",
				uploaded_filename: upload_filename,
				filename: "voice-message.ogg",
				duration_secs: await getAudioDurationInSeconds(audioPath),
				waveform: ""
			}
		],
		flags: 1 << 13 // Voice message flag
	})
});