Thank you for posting your solution. I ran into the same problem and was
able to resolve it by creating a Signature Key. The docs do say that you
"must configure a Signature Key in the Authorize.net Merchant Interface
before you can receive webhook n...
Thanks for posting your solution. I was running into that same error
when trying to create webhooks since I also had not set up a Signature
Key. The documentation does say that you need to create a key "before
you can receive webhook notifications" b...
