Verifying a Back in Stock webhook

webhook_verification.rb

SHARED_SECRET = 'your_back_in_stock_api_key'

def verify_webhook(data, signature)
  digest  = OpenSSL::Digest::Digest.new('sha256')
  calculated_hmac = Base64.encode64(OpenSSL::HMAC.digest(digest, SHARED_SECRET, data)).strip
  calculated_hmac == signature
end

signature = request.headers["X-BIS-Signature"]
data = request.body

if verify_webhook(data, signature)
  puts "Verified"
else
  puts "Webhook signature doesn't match"
end