Integrating particle.io with keen.io

Has anyone had success with creating a webhook through dashboard.particle.io/user/integrations? I’ve successfully created a webhook to keen.io, but no event collection appears on the keen platform. I used this URL format https://api.keen.io/3.0/projects/<keen_project_id>/events/<collection_name>?api_key=<writekey>
request type “POST”.

I have also tried using NodeJs and opening a keen.json file with the command
particle webhook create keen.json, which is what a guide here https://keen.io/docs/integrations/particle/

suggests, however it asks for a URL just like the other GET,POST commands.

I do not know what I have done wrong. Also, the webhook is triggering a hook-sent.

Any help would be greatly appreciated.

Complete noob,
TT300zx