V_ret_string || 'American Express Credit Card Number.' V_ret_string := v_ret_string || 'MasterCard Credit Card Number.' ĮLSIF SUBSTR (cc_number, 1, 2) = 34 OR SUBSTR (cc_number, 1, 2) = 37 /* check if amex card */
CREDIT CARD VALIDATOR PYTHON CODE CODE
display whether the number is valid or not, and what type of card (if possible) The code should contain the following functions: main () isValid () returns True or False. V_ret_string := v_ret_string || 'Visa Credit Card Number.' ĮLSIF SUBSTR (cc_number, 1, 2) BETWEEN 51 AND 55 /* check if master card*/ The Python code does the following: prompt users to enter a credit card number as a string. IF LENGTH (cc_number) = 13 OR LENGTH (cc_number) = 16 IF SUBSTR (cc_number, 1, 1) = '4' /* check if it is a Visa card */ (PYTHON)Credit card number validation Program Credit card numbers follow certain patterns: It must have between 13 and 16 digits, and the number must start with: 4 for Visa cards 5 for MasterCard credit cards 37 for American Express cards 6 for Discover cards In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card numbers. * Credit card number is valid now check for its type */ V_ret_string := 'Not a valid Credit Card Number.' * Credit card number is invalid if below funciton returns non zero value */ Generated by the banks, Visa and MasterCard have their own algorithm (based on private key) using the personal account number, the expiry date of the card and the service code, this information is then compared by those calculated by the bank.
CREDIT CARD VALIDATOR PYTHON CODE VERIFICATION
N_ntoi := TO_NUMBER (SUBSTR (p_ccnumber, n_ntoc + 1 - i, 1)) CVC (Card Validation Code) or CVV (Card Validation Value) or verification codes are 3-digits located on the back of bank cards. CREATE OR REPLACE FUNCTION validate_CC (cc_number IN VARCHAR2)įUNCTION check_luhn_algo (p_ccnumber VARCHAR2) Function CHECK_LUHN_ALGO to check the number using Luhn algorithm is written inside the function VALIDATE_CC, so if you want to add the more card types support then no need to change the CHECK_LUHN_ALGO function, change only the main part of the VALIDATE_CC function. You can modify to add more Credit Card types. Currently, this PL/SQL function supports three kinds of the Credit Cards which are Visa, MasterCard, and American Express. The following function takes an argument as Credit Card number and then validates the number using Luhn algorithm and returns its type. PL/SQL Function Example to Validate Credit Card Number and Its Type in Oracle