Here is blog post number 26 about getting paid by your customers. This material is taken from the article, “How to Collect from Anyone (Even Enron)” found in Inc. Magazine,
Way to get paid #26: Ask for the Oldest First: Another proven method: If a customer owes you for more than one invoice, you should start by looking to collect on only the oldest invoice. “Asking for all of them at once can seem too insurmountable”. And the collecting “tends to get easier once you’ve gotten the oldest one.” Plus, by asking for payment on only the oldest invoice, you are subtly currying goodwill with the customer, who will appreciate your leniency in not demanding the entire debt
“He who knows when he can fight and win and when he cannot, will be victorious.”— from The Art of War by Sun Tzu.
“So the last shall be first, and the first shall be last.” — (Matt. 20:16) from the King James Translation