Fixed Companion API authentication problems
Unfortunately, testing done immediately after the update confirmed that the cAPI was still broken. After some time, it started working, at least sometimes. The situation has grown better over the course of the day, but it is still incredibly flaky. Patience is required.
What is also required are updates to the tools using the CAPI because FDev also changed its structure and the data values. At the moment, only EDMC version 2.4.3 looks to be working correctly. At least, as far as updating price, outfitting, and shipyard information is concerned. Export of ship stats including engineer modifications only works for the current ship, and only with ED Shipyard. Coriolis will follow during the weekend. Inactive ships probably never.
TL;DR: Update EDMC to 2.4.3. Be prepared for problems.