Api endpoint challenge response for twitter

I’m trying to do the same thing. I haven’t cracked it but will share what I know in the hope it helps you and others.

As far as I can tell, this needs a backend workflow api, but these can only triggered by a post request and as you know, the CRC is a GET request.

There are various workarounds using other platforms such as amazon api gateway, pipedream and integromat to transform. There is a fairly detailed pipedream setup here

I’m (slowly) trying to get my head around integromat for this purpose and if I figure it out, I’ll update. Good luck (and pls share if you’ve solved this in the mean time).