curl -X POST https://license.jellydropsllc.com/api/license/validate \
  -H "Content-Type: application/json" \
  -H "X-Machine-ID: ABCDEF123456" \
  -d '{
    "payload": "eyJtYWNoaW5lX2lkIjoiQUJDREVGMTIzNDU2IiwiZXhwaXJ5IjoiMjAyNi0wNi0xNCIsImZlYXR1cmVzIjpbImdwdSIsIm9jciJdfQ==",
    "signature": "MEUCIFYpvUo25r1Ez1YGTnX49DdGoOeAb464Clrf9JdLpl4TAiEAiVJec9U1qLE6ID9bB4vewe3qoj2qB8gFUBSd687b5no="
  }'