curl --request POST \
  --url https://api.deliverable.co/gateway/verify/single \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "email": "user@example.com"
}
'

{
  "message": {
    "status": "success",
    "statusCode": 200,
    "description": "Email added to queue successfully"
  },
  "data": {
    "task_id": "task_abc123xyz"
  }
}