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Runnable example in examples/typescript/ covers upload, messaging, approval, and download in a single script.

​
Send a Message

Use the built-in fetch API (Node.js 18+): 
const PLACET_URL = 'https://your-placet-instance.com';
const API_KEY = 'hp_your-api-key';
const CHANNEL_ID = 'your-agent-id';

const headers = {
  'x-api-key': API_KEY,
  'Content-Type': 'application/json',
};

const resp = await fetch(`${PLACET_URL}/api/v1/messages`, {
  method: 'POST',
  headers,
  body: JSON.stringify({
    channelId: CHANNEL_ID,
    text: 'Build completed successfully.',
    status: 'success',
  }),
});

const msg = await resp.json();
console.log(`Message sent: ${msg.id}`);

​
Upload a File

Upload a file without creating a message (can be attached later): 
const form = new FormData();
form.append('file', new Blob([fileBuffer], { type: 'application/pdf' }), 'report.pdf');
form.append('channelId', CHANNEL_ID);

const uploadResp = await fetch(`${PLACET_URL}/api/v1/files/store`, {
  method: 'POST',
  headers: { 'x-api-key': API_KEY },
  body: form,
});

const attachment = await uploadResp.json();
console.log(`Uploaded: ${attachment.filename} (id: ${attachment.id})`);

​
Send Message with File & Approval

Attach a previously uploaded file and request human approval: 
const approvalResp = await fetch(`${PLACET_URL}/api/v1/messages`, {
  method: 'POST',
  headers,
  body: JSON.stringify({
    channelId: CHANNEL_ID,
    text: 'Please review the attached report.',
    status: 'warning',
    attachmentIds: [attachment.id],
    review: {
      type: 'approval',
      payload: {
        options: [
          { id: 'approve', label: 'Approve', style: 'primary' },
          { id: 'reject', label: 'Reject', style: 'danger' },
        ],
      },
    },
  }),
});

const approvalMsg = await approvalResp.json();

// Long-poll for the review response (up to 30s)
const reviewResp = await fetch(
  `${PLACET_URL}/api/v1/reviews/${approvalMsg.id}/wait?channel=${CHANNEL_ID}&timeout=30000`,
  { headers },
);
const review = await reviewResp.json();

if (review.status === 'completed') {
  console.log(`Decision: ${review.message.review.response.selectedOption}`);
}

​
Download a File

const dlResp = await fetch(`${PLACET_URL}/api/v1/files/${attachment.id}/download`, {
  headers: { 'x-api-key': API_KEY },
});

const buffer = await dlResp.arrayBuffer();
// Save or process the file buffer

​
Report Agent Status

await fetch(`${PLACET_URL}/api/v1/status/ping`, {
  method: 'POST',
  headers,
  body: JSON.stringify({ agentId: CHANNEL_ID, status: 'active' }),
});