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Use sample.csv when has_header=true. Use sample_no_header.csv when has_header=false and set phone_column to a 1-based index.

curl -s \
  -F "file=@sample.csv" \
  -F "phone_column=phone" \
  -F "default_region=IT" \
  -F "has_header=true" \
  -F "delimiter=auto" \
  -F "mask_mode=none" \
  -F "hash_enabled=false" \
  https://e164.it/v1/batch/parse \
  -o result.csv

Supported delimiters: auto, comma (,), semicolon (;), tab ("")
Phone column: header name (when header present) or 1-based index (no header)
Options: masking (none/last2/last4), hash (HMAC-derived) when enabled