WhatsApp Bulk Messaging API: Campaigns Without Breaking Sessions

Need to notify customers, announce launches, or run support broadcasts? Omdaa's bulk campaigns API lets you queue multi-recipient WhatsApp jobs with pause/resume — included in Free Forever.

Series: Free Forever WhatsApp Dev · Respect WhatsApp ToS & local anti-spam laws.

Responsible bulk (read this first)

• Prefer opt-in audiences only
• Throttle; don't blast cold lists
• Use clear identity + unsubscribe path
• Keep messages transactional / expected
• Test on a small cohort first

Omdaa gives you the API plumbing — compliance is your responsibility.

Install SDK

``bash npm install @omdaafreeapi/omdaa-api-client `

Create a campaign

`javascript const { OmdaaClient } = require('@omdaafreeapi/omdaa-api-client');

const client = new OmdaaClient({ apiKey: process.env.OMDAA_API_KEY });

const job = await client.bulk.createCampaign({ sessionId: 'default', name: 'march-product-update', message: 'Hi {{name}} — your Omdaa workspace update is live.', recipients: [ { to: '201111111111', vars: { name: 'Sara' } }, { to: '201222222222', vars: { name: 'Omar' } }, ], });

console.log('Job:', job.data?.id || job); `

See API docs and SDK v1.2+ for payload fields (createJob is an alias of createCampaign).

Monitor · pause · resume

`javascript const status = await client.bulk.getJobStatus(jobId); console.log(status);

await client.bulk.pause(jobId); await client.bulk.resume(jobId); `

Via Cursor MCP: create_bulk_campaign, get_bulk_job_status, pause_bulk_job, resume_bulk_job.

Architecture that scales

` Audience CSV → Normalize phones → Omdaa bulk job → WhatsApp ↓ Webhook events → n8n / Sheets / CRM `

Log deliveries with the Zapier Sheets tutorial or n8n.

Best practices checklist

Combine with AI

Use Omdaa AI for inbound replies after a campaign, not for spraying generative spam outbound.

Related

• WhatsApp bot in 5 minutes
• Webhooks guide
• Cursor MCP

Omdaa API — Free Forever. Bulk tooling included — use it ethically.