Starbucks bulk card checker

gistfile1.txt

#!/usr/bin/env bash

echo ""
while IFS=, read -r CARD_NUMBER CARD_PIN
do
  printf "$CARD_NUMBER   "
  wget -O - -o /dev/null https://www.starbucks.com/card/guestbalance --post-data="Card.Number=$CARD_NUMBER&Card.Pin=$CARD_PIN" \
    | grep fetch_balance_value \
    | grep -oP '\>\K[^</]+'
done < cards.csv