Hi Jason27,Thanks for providing the whole function. I found the difference on where it broke for my code:I was lacking `urldecode()` on `http_build_query($params)` and that happened to coincidentally break the hmac checks on only bulk calls.Thank you...

Did that chatgpt solution work for you? In my test that didn't work and it's already one of the solutions I've tried in the past. (Wrap in [ ], wrap values in double quotes, separated by comma and space).

Hello,I've added a bulk action link and while the default hmac validation works in all other cases, it fails on bulk action. For example, if you add a bulk action "orders action drop-down", select multiple orders and then try to validate that request...