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Custom bitbucket webhook secret handling

Hi, I am working with receiving updates from BB on Comments (Added, edited, deleted) and PR Actions (Declined, deleted). 

I am trying to implement a secret on the webhook, however, am inexperienced with doing any sort of cryptography. My understanding is that I need to take the message body and encrypt it using HMACSha256 with the secret as the key and that should equal the value in the "X-Hub-Signature" header. (here) However, when I try this I do not end up with the same values. What is the format that we are expected to use for the body when encrypting it?

 

I am having a hard time discerning if my trouble is being caused by my incompetence in encrypting it or my incompetence in formatting the body correctly.

 

I am currently trying to use the value directly given from the request on BB on a single line, with no newlines. 

BBRequest.PNG

Does anyone have any experience with this that can point me in the right direction?

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