Issues

Hello folks,
I'm trying to integrate Verihubs with our application.
Here for sending the request, in the body it proves an option called "Premium".

{
"msisdn": "62123456789",
"text": "This is text example",
"premium": false,
"callback_url": "https://some-callback-url"
}

Could someone help me understand the importance of it ?
Like whats the difference when I make it true or false from the customer experience aspect and also if it has any impact on billing aspects ?