Good ways of AR-Collection

[The Intern]

Hello everyone,

I am currently researching for ways to improve our AR-Collection as a distributer. Thereby I am looking for more innovative solutions than simply calling the customers and insisting on an immediate payment like most companies do -D
I am an Intern in our department and should create a presentation about this topic. My boss wants to have examples of other companies, which are really good in AR-Collection and wants to know why. But I don't really know, where I could find such information about them.
Any advice/ examples?

Thanks in advance,

The Intern