Hello there, how did you get it to work?  I am using the below atm. But couldn't get it to work.  let jsonString = JSON.stringify(req.body); const generated_hash = crypto .createHmac('sha256', secret) .update(jsonString) .digest('base64'); 

am I doing it correctly in node.js?  let jsonString = JSON.stringify(req.body); const generated_hash = crypto .createHmac('sha256', secret) .update(jsonString,'utf8','hex') .digest('base64');