Send Message to Chatwoot

[inovisedigital]

I'm having trouble sending a message to Chatwoot. I'm using the Application API endpoint api/v1/accounts/{nnn}/conversations/{nnn}/messages with attachments and I've tried everything (HTTP request, code with axios, with fetch, with helpers) and nothing works! Error 422 without any details, poor documentation...

The last one I tried was this:

const url = 'https://[domain]/api/v1/accounts/{nnn}/conversations/{nnn}/messages';
const nodeDeConversao = $('ConvAudioToBin').first().binary;
const body = {'content': $('dataSet').first().json.msgTexto, 'message_type': 'incoming'};

const options = {
method: 'POST',
url: url,
headers: {
'api_access_token': apiToken,
'content-type': 'multipart/form-data',
'accept': 'application/json'
},
body: body,
json: true}

// If a binary exists, attach it using the helper
if (nodeDeConversao.data) {
options.body['attachments[]'] = nodeDeConversao.data; // remembering this is a binary after node "convert to file"
}

try {
const response = await helpers.httpRequest(options);
return { json: response };
} catch (error) {
return {
json: {
error: true,
message: error.message,
details: error
}
};

}

I checked the attachment and it's there, it exists, but I'm sure it's some detail in the body of the Message, schema validation...
The response is always "message: Request failed with status code 422, name: AxiosError" and nothing else.

Can someone help me? Thank you