For Visa, MasterCard, and Discover cards, the card code is the last 3 digit number located on the back of your card on or above your signature line.
For American Express, it’s a 4 digit number that appears on the front of your card, above and either on the left or right of the card number (see below).
ALTERNATIVE PAYMENT OPTIONS: If you would prefer
to join the Alliance using a method other than online credit card
transaction, please contact Madaly Alcala at madaly (at)
ecologycenter.org or 510-548-2220 ext 243.