I feel properly dumb right now.

I should have pasted the public key as plain text from the start, but noooooo. Google it, they say, someone else will have had the same problem they say.

Paste where? What problem?

@asgs I copied a public key from a web UI, pasted it into my IDE and didn't even think to check for line breaks. Webhook handler kept throwing 500 errors lmao. I should have checked those line breaks... Or paste as plain text from the start.

Aren't line breaks part of plain text though