curl --request POST \
  --url https://api.jup.ag/trigger/v2/auth/challenge \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "walletPubkey": "BQ72nSv9f3PRyRKCBnHLVrerrv37CYTHm5h3s9VSGQDV",
  "type": "message"
}
'

{
  "type": "message",
  "challenge": "Sign this message to authenticate with Jupiter Trigger Order API: abc123..."
}