[Moru]

Yes indeed, we had connected all our invoicing to a company handling sending bills and receiving money. The support was getting worse and worse but it would cost too much to rewrite the code that interfaced with their special API's. One day they had a new API that was even worse to use and announced EOL for the old API in a couple of months. Suddenly the cost calculation was completely different and we could finaly change to a better company with better support. Turns out the new one was much easier to interface with and it was even cheaper than the old one. We really needed that push to change!

[bombcar]

Anyone who is selling APIs needs to realize this will almost certainly happen when you turn off the old one - those people haven't upgraded to your latest for a reason, and if upgrading is hard enough they'll re-evaluate the whole deal.