Which is the worst API you've worked with? Facebook? LinkedIn?

Instagram for security reasons. And any undocumented API for painful reasons

Facebook chat bot for sure. bad examples and poor documentation

Lightspeed retail API http://cloud-docs.lightspeedapp.com/... what a fucking nightmare.

Yougotlistings rental api http://www.yougotlistings.com poor documentation

Does fixed length files count as an API? I think it was Paymentech.

Had to work with the Elavon payment gateway once to implement 3D secure, never again!

https://resourcecentre.elavonpaymentgateway.com/...

wow you guys are crying for no reason... i have to use api that obly use GET and the params is a single line xml. The onther one i have to fit 70+ params in the url and the jaon it returns is had written, the http status is always 200 but in the body therer a hand written json with the correct status... thats shitty api....

Knack

@Neo- there's a technical reason for always returning HTTP 200 and having the true response code in the response body. Not all HTTP clients are equal like the one in Flash's ActionScript.

eventbrite.

Google's Android API. ... Deprecated.... Deprecated everywhere...