curl --request POST \
  --url https://api.zupy.com/api/v2/auth/request-otp/ \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "identifier": "<string>"
}
'

{
  "status": "sent",
  "channel": "whatsapp",
  "expires_in": 300
}