In order to stay HIPPA Compliant Infusionsoft is updating from TLS 1.0 to TLS 1.2 This means that any integration using 1.0 will stop working on April 17th, 2018. Please update your systems to TLS 1.2 by then to maintain normal functionality.
How and what we must change in our API code?
Updating any servers that use api calls (anything connected to your IS app through another service other than Infusionsoft) with the new TLS version. If you have an integrated wordpress site, for example, then the server running it must be upgraded to TLS 1.2.