In order to send messages using the messaging API, you will need to general a Profile Secret. This will then be sent as a part of an authentication header.
POST https://sms.api.oneuc.com/messages/sender_id
QUERY STRING
account_id: Your Flex UC Account ID
api_key: Your Flex UC API Key
You can request your account_id and api_key from support
Response
If you have provided a valid account_id and api_key you should get a response that looks like this:
{
"sms_id": "3b6ab7b7-994b-4c44-b89a-e9c33f5e47a6"
}