Wait, I’m confused here. If you and your company owns said software and data, why are you going through an API? This doesn’t add up at all. If you own the database or even have access to the data, why are you calling an API? APIs should only be used if there is no way around getting data and you want to expose “some” information.
It doesn’t make sense to me that you have the software and the data, but want to go through an API. Why not just make a database call and output that data to the customers? 
or am I missing something here?