import os
    from checkharbor import Checkharbor
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client = Checkharbor(api_key=os.environ["CHECKHARBOR_API_KEY"])

# 1. Create job from CSV file
with open("emails.csv") as f:
    job = client.batch.create(
        type="email",
        csv_string=f.read(),
        webhook_url="https://myapp.com/webhook/checkharbor",
    )
print("Job created:", job["id"])

# 2. Poll until done
done = client.batch.wait_until_done(
    job["id"], poll_seconds=5, timeout_seconds=600
)
print(f"Processed {done['processed_rows']}/{done['total_rows']} rows")

# 3. Download and parse
import csv, io
csv_content = client.batch.download_result(done)
reader = csv.DictReader(io.StringIO(csv_content))
for row in reader:
    if row["deliverability"] == "undeliverable":
        print("Remove:", row["input"])
```

    # 1. Upload
    JOB=$(curl -s -X POST https://api.checkharbor.com/v1/batch \
      -H "X-Api-Key: chk_live_..." \
      -F "type=email" \
      -F "file=@emails.csv")
    JOB_ID=$(echo $JOB | jq -r '.id')
    echo "Job: $JOB_ID"
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# 2. Poll
while true; do
  STATUS=$(curl -s https://api.checkharbor.com/v1/batch/$JOB_ID \
    -H "X-Api-Key: chk_live_...")
  DONE=$(echo $STATUS | jq -r '.status')
  echo "Status: $DONE"
  if [ "$DONE" = "done" ]; then break; fi
  if [ "$DONE" = "failed" ]; then echo "FAILED"; exit 1; fi
  sleep 5
done

# 3. Download
RESULT_URL=$(echo $STATUS | jq -r '.result_url')
curl -o results.csv "$RESULT_URL"
```