Parameters - ClientBillingReference
This parameter sets the Billing Reference of your message. This parameter, generated by you, helps you track the number of messages you send per application or client, if you have multiple application or client uses.
This parameter is of value when your message-sending application is sending messages on behalf of multiple clients or applications, and you wish to track each client or application’s message-sending volume.
At the end of any month you can run a report from your online account that will show you how many messages were sent with each of the clientBillingReference values that you have used.
If you are sending messages on behalf of a single application or client and you have no need to track messages sent by clientBillingReference, then just set the parameter to any value that you wish.