Once the API is up again, you can enable calls again. This incident shows that there are some possible improvements to do in the PrestaShop's core regarding API calls, and we will work on improvement. We sincerely apologize for the inconvenience.
— PrestaShop (@PrestaShop) October 1, 2018
https://goo.gl/EO0ad1
https://goo.gl/xF8heB