curl -X POST https://license.jellydropsllc.com/api/license/validate \
  -H "Content-Type: application/json" \
  -H "X-Machine-ID: ABCDEF123456" \
  -d '{
    "payload": "eyJtYWNoaW5lX2lkIjoiQUJDREVGMTIzNDU2IiwiZXhwaXJ5IjoiMjAyNi0wNi0xMyIsImZlYXR1cmVzIjpbImdwdSIsIm9jciJdfQ==",
    "signature": "MEYCIQC/sk5X+yDS3rttB8mCEd2JfHaeBXBdlmgmQCcoPPtFqwIhAP7u5Hzm06trr7ghE/hvfg7kl0M4P3swQddNbkXEQisi"
  }'