Provide "YOUR_API_KEY".
The SMS route. For DLT SMS, always use "dlt_manual".
An array of objects containing SMS details.
User Defined Field 1 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.
User Defined Field 2 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.
User Defined Field 3 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.