WhatsApp API CRM Integration

I need a developer who has already worked with the WhatsApp Business Cloud API to hook it into our own in-house CRM via webhooks. The goal is straightforward: once the integration is live I must be able to send and receive WhatsApp messages from inside the CRM using our Meta-approved business number. No template catalog or personalised templating is required; we’ll start with plain text messaging and build on that later.

You will be expected to:
• Build the webhook endpoints that capture incoming messages and push them into our existing messaging module.
• Create the outbound message flow so agents can reply or start conversations directly from any contact record.
• Handle authentication with Meta, including token refresh, and document the required environment variables for our DevOps team.
• Provide concise setup notes or a short recorded demo so we can reproduce the installation on staging and production.

Our stack is PHP 8 with a MySQL back-end; vanilla JS on the front end. If you prefer Node or Python for the middleware layer I’m open to it as long as you supply clear hand-off docs.

Acceptance will be based on a live test: a message sent from a phone must appear in the CRM within two seconds, and an agent’s reply must reach that phone just as quickly.

If you’ve shipped similar WhatsApp solutions before, please mention the key APIs or libraries you used and roughly how long delivery took.