You know that feeling. We have all been there. Every one of us. The overdue invoice- “Hmmmm I wonder if they have just forgotten” you think. But the days pass and still no payment. So you send a reminder. Still nothing. So you send another reminder. Still nothing. And the reality hits you- “I am going to have to call them”. “But what if they take it the wrong way”.
Sound familiar? I went through these very same emotions 7 years ago and calling customers for payment remains to this day, one of the most awkward jobs small business owners have to do. Please watch this video though and you will see that is all in your head 
How to ask for your money without offending