curl https://api.thanxsandbox.com/push_registrations \
  -X PUT \
  -H "Content-Type: application/json"  \
  -H "Accept-Version: v4.0" \
  -H "Accept: application/json" \
  -H "Authorization: Bearer ${token}" \
  -H "X-ClientId: ${client_id}" 
  -d '{
    "push_registration": {
      "device_type": "ios",
      "token": "wourdweroi238432423425fsgd"
    }
  }'

{
  "push_registration": {
    "token": "wourdweroi238432423425fsgd",
    "device_type": "ios"
  }
}