Your (api) SSL/TLS certificate has expired as of today.. Rendering the API useless. I must say that it astonishes me that companies can let this happen..
hint: maybe use let's encrypt
I just sent you an email letting you know that we are aware of the issue and we are currently working on a fix that should get it back up and running by end of day today. Please let us know if there is anything else we can do for you.