Messages

Upload media once, send many times

POST/v2/media

Scope:messages:send
Idempotency-Key:optional
number key ok— Also accepts the legacy per-number x-api-key, for its own number.
uses quota

Returns a media id valid 24 h on the same number. Also accepts JSON {"numberId", "url"}.

Parameters

Headers

Name	Type	Constraints	Description
`Idempotency-Key`optional	Type`string`	Constraints≤ 191 chars	DescriptionYour unique id for this operation (≤ 191 visible ASCII). A retry with the same key and body returns the first answer with `Idempotent-Replayed: true` — it never runs twice. Kept 24 h.
`X-Request-Id`optional	Type`string`	Constraints—	DescriptionOptional: your own request id, echoed back (otherwise we generate `req_…`). Quote it to support.

multipart/form-data fields

Name	Type	Constraints	Description
`numberId`optional	Type`string`	Constraints—	DescriptionThe number that will send the file — an upload can be used by that number only, for 24 hours.
`file`optional	Type`file`	Constraints—	DescriptionThe file bytes (multipart). The real type is sniffed from the bytes; the file name is never trusted.

Request

POST /v2/media

curl -X POST "https://mursilat.com/api/v2/media" \
  -H "Authorization: Bearer $WASLA_API_KEY" \
  -H "Idempotency-Key: order-1042-confirm" \
  -F numberId="cm1abcd2345efgh6789ijkl" \
  -F file=@logo.png

import fs from 'node:fs';

const form = new FormData();
form.append('numberId', "cm1abcd2345efgh6789ijkl");
form.append('file', new Blob([fs.readFileSync('logo.png')]), 'logo.png');

const res = await fetch('https://mursilat.com/api/v2/media', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.WASLA_API_KEY}`,
    'Idempotency-Key': 'order-1042-confirm',
  },
  body: form,
});
const data = await res.json();
if (!res.ok) throw new Error(`${data.error.code}: ${data.error.message}`);
console.log(data);

import os
import requests

headers = {"Authorization": f"Bearer {os.environ['WASLA_API_KEY']}", "Idempotency-Key": "order-1042-confirm"}
res = requests.post(
    "https://mursilat.com/api/v2/media",
    headers=headers,
    data={
        "numberId": "cm1abcd2345efgh6789ijkl"
    },
    files={"file": open("logo.png", "rb")},
    timeout=30,
)
data = res.json()
if not res.ok:
    raise RuntimeError(f"{data['error']['code']}: {data['error']['message']}")
print(data)

<?php
$ch = curl_init('https://mursilat.com/api/v2/media');
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer ' . getenv('WASLA_API_KEY'),
        'Idempotency-Key: order-1042-confirm',
    ],
    CURLOPT_POSTFIELDS => [
        'numberId' => 'cm1abcd2345efgh6789ijkl',
        'file' => new CURLFile('logo.png')
    ],
]);
$data = json_decode(curl_exec($ch), true);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($status >= 400) { throw new Exception($data['error']['code'] . ': ' . $data['error']['message']); }
print_r($data);

Response

200Example

200 — application/json

{
  "mediaId": "med_8f2c1d9a7b3e4f56a1b2c3d4",
  "mimeType": "image/png",
  "size": 48213,
  "fileName": "logo.png",
  "expiresAt": "2026-10-14T08:00:00.000Z",
  "numberId": "cm1abcd2345efgh6789ijkl"
}

Response schema

Fields of the example answer. Expand objects and arrays.

responseobject6 fields
- mediaIdstring "med_8f2c1d9a7b3e4f56a1b2c3d4"
- mimeTypestring "image/png"
- sizeinteger 48213
- fileNamestring "logo.png"
- expiresAtstring "2026-10-14T08:00:00.000Z"
- numberIdstring "cm1abcd2345efgh6789ijkl"

Errors

Besides the authentication, rate-limit and validation errors every endpoint can return:

400MESSAGE_MEDIA_REQUIREDA file / media is required.
413MESSAGE_MEDIA_TOO_LARGEFile over the type limit.
422MESSAGE_MEDIA_FETCH_FAILEDmedia.url could not be fetched safely.

Errors →

Try it

Send this request from your browser to the Mursilat API.

documented example

Preview — this copy of the docs isn’t on mursilat.com, so the console shows the documented example instead of calling the API.

Real requests use your real number and plan: they can send WhatsApp messages, spend quota and delete data. (uses quota)

API key

Kept only in this tab’s memory: never saved, never put in the URL, sent only to mursilat.com. Reloading the page forgets it.

Idempotency-Key

multipart/form-data → curl

The same request with curl

curl -X POST 'https://mursilat.com/api/v2/media' \
  -H "Authorization: Bearer $WASLA_API_KEY" \
  -H 'Accept: application/json'