I'll connect WhatsApp messaging and one-time passcodes to your existing app, so you can verify logins and send receipts, invoices and order updates where your customers actually read them.

What you get:

• OTP send + verify wired into your login or checkout flow, with code expiry, attempt limits and single-use enforcement • Message sending from your own WhatsApp number — text and PDF documents • Delivery webhooks so your system knows what was delivered and read • Error handling, retries and logging, so failures are visible rather than silent • A short handover doc covering the endpoints and how to change templates

Works with any backend — Node, .NET, PHP, Python, Laravel, Rails.

I built and run the API behind this myself, so integration problems get fixed at the source instead of escalated to a vendor's support queue.

Tell me what you're building and which flow needs it, and I'll confirm scope and timeline before we start.