I'm a nice guy.

Now this customer's payment ($4-Figures already) has been outstanding for 60days. But I'm a nice guy.

So I'm supposed to meet him later and collect my payment, as we spoke earlier about it. Allow me to remind that I'm a nice guy.

What do you suppose I should do if he somehow tries to delay payment further? I know that I'm a nice guy, but my boss isn't as patient as me, and he is urging me to take legal actions.

And now I'm wondering how to put it in words to this customer of mine, 'cos I'm a nice guy.

Mind sharing your thoughts please?