Check which emails already have accounts

curl -X POST 'https://api.expiryedge.com/v1/check-emails' \
  -H "Authorization: Bearer $EXPIRYEDGE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "emails": [
    "maria@northwinddental.com",
    "li.wei@contosolegal.com"
  ]
}'

{
  "registered_emails": [
    "li.wei@contosolegal.com"
  ],
  "available_emails": [
    "maria@northwinddental.com"
  ]
}