curl --request POST \
  --url https://orbitflare.com/api/customer/v2/auth/wallet/challenge \
  --header 'Content-Type: application/json' \
  --header 'X-ORBIT-KEY: <api-key>' \
  --data '
{
  "wallet_address": "<string>"
}
'

{
  "success": true,
  "data": {
    "challenge": "<string>",
    "expires_in": 123
  }
}