We had just changed to a new company running our invoices. They were still developing their API and we wrote code to transfer our invoices to them for printing and distributing. They were expensive and there was starting to pop up new competition for them. But we had already working code with them so we could not justify the cost of rewriting it. Suddenly they deprecated the old API forcing us to rewrite. Or liberated us to change to a cheaper and better alternative.

Well, we took the opportunity to change provider and are very happy now :-)