How do I send a WhatsApp message using cURL?

Send a POST request to https://graph.facebook.com/v25.0/{PHONE_NUMBER_ID}/messages with header 'Authorization: Bearer {ACCESS_TOKEN}' and JSON body containing messaging_product='whatsapp', recipient_type='individual', to, and type (text/template).

How do I verify Meta WhatsApp webhook signatures?

Meta signs webhook payloads using HMAC-SHA256. Calculate the HMAC of the raw request body using your App Secret as key, and compare it with the X-Hub-Signature-256 header.

Free Developer Tool · Meta Cloud API v25.0

WhatsApp Cloud API cURL Generator & Webhook Debugger

Build, test, and copy ready-to-run Meta Cloud API cURL commands or inspect inbound webhook JSON payloads in real time.

WhatsApp Webhook & cURL Developer Debugger UI

Phone Number ID

Recipient Phone Number (E.164)

Message Type

Message Content / Text

🔒 Meta Webhook HMAC-SHA256 Signature Verification Flow

Every inbound POST webhook from Meta is cryptographically signed using your App Secret (`x-hub-signature-256`).

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WhatsApp Cloud API cURL Generator & Webhook Debugger

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🔒 Meta Webhook HMAC-SHA256 Signature Verification Flow