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Use POST /v1/whatsapp/messages/text to reply to a customer with plain text. Text needs an open 24-hour window — if the customer has not messaged you in the last 24h, the send returns 422 WINDOW_CLOSED; send a template to open one.

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Endpoint

POST https://karibu.briq.tz/v1/whatsapp/messages/text
Headers: X-API-Key (required), Content-Type: application/json.

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Fields

FieldTypeRequiredNotes
bodystringyesThe message text, up to 4096 characters.
tostringtargetThe customer number in E.164. The number you are messaging.
senderstringnoWhich of your numbers to send from. Optional when your workspace has one active sender.
conversation_iduuidaltAlternative to to + sender: an existing thread to reply in.

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Example

cURL
curl -X POST "https://karibu.briq.tz/v1/whatsapp/messages/text" \
  -H "X-API-Key: YOUR_API_KEY" -H "Content-Type: application/json" \
  -d '{ "to": "255712345678", "body": "Thanks, your order ships today." }'
Returns 202 { message_id, status: "pending" }. Then track delivery. Build and send a live request from the Send a text message reference page.