Board Thread:The Quarters - Q & A/@comment-73.18.179.214-20170909101009/@comment-25085701-20170912210815

I don't know enough about webhooks specifically to give you a solution using those, but maybe you can work around it by using the API directly. I'd do it as a curl call, using a POST operation as:

https://habitica.com/api/v3/user/buy-gear/:key

where :key is the name of the item as found in the source code. You'll also need to remember to supply your API key and UserID to the script, and that might be what's holding you up.