I'm the developer of Agadar's Telegrammer (viewtopic.php?f=15&t=388960). Recently a user contacted me telling me he's receiving HTTP status code 403 when attempting to send telegrams. I checked with my own API keys and sure enough I get the same HTTP status code 403. Using my IDE's debugger I discovered the exact message I am receiving is 'client not registered for api' when sending telegrams'. This is quite strange seeing as neither my code nor my keys have changed in literal years.
Has anything changed that can cause these 403's to appear?
