The SendTransactionalWhatsapp function sends transactional WhatsApp messages to recipients.

You must use your own partnerId (which you can find in the dEngage Panel > Instant Message Partner Details page) along with the payload to send messages.

One important note: you can send only one message to a single recipient at a time.

If the components required for the specified WhatsApp message template (templateName and languageCode) are not provided, the request will return a successful response, but the message will fail to send.

Language Selection Logic for WhatsApp REST API

When sending WhatsApp messages via REST API, multi-language template support is now available. The system determines which template to send by following this order of checks:

1. Request-level languageCode

If languageCode is provided in the request and a template exists in that language, that template is used.

2. Recipient’s language

If no matching template is found for the request’s languageCode, the system checks the recipient’s language.

If a template exists in the recipient’s language, it will be used.

3. Account-level language

If no recipient language match is found, the system checks the account’s default language.

If a matching template exists for the account language, it is used.

4. Fallback to default template

If none of the above provide a match, the system falls back to the first available template in the list.

Idempotency Support: This endpoint supports idempotency via the optional traceId parameter. For more information, see Rest API Idempotency.