CardValidator Class

Properties   Methods   Events   Config Settings   Errors  

The CardValidator class is used to verify that a given credit card number is formatted properly, and could be a valid card number. Validating a card before actually submitting a transaction for authorization can reduce the fees that may be associated with invalid or declined transactions.

Syntax

CardValidator

Remarks

Utilization of this class catches accidentally mistyped card numbers and allows buyers to re-input their number without having the transaction declined. It can also determine the type of credit card (Visa, MasterCard, Discover, etc) to easily determine if the customer is presenting a payment type which you do not support. The class can also parse swiped track data and perform these same checks on it.

There are three checks performed on the customer's credit card information:

The ValidateCard method explains these checks in more detail.

Property List

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the class with short descriptions. Click on the links for further details.

CardExpMonth Property (CardValidator Class)

Expiration month of the credit card specified in CardNumber .

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetCardExpMonth();
int SetCardExpMonth(int iCardExpMonth);

Unicode (Windows)
INT GetCardExpMonth();
INT SetCardExpMonth(INT iCardExpMonth);

int inpay_cardvalidator_getcardexpmonth(void* lpObj);
int inpay_cardvalidator_setcardexpmonth(void* lpObj, int iCardExpMonth);

int GetCardExpMonth();
int SetCardExpMonth(int iCardExpMonth);

Default Value

1

Remarks

This field contains the month portion of the expiration date of the customer's credit card. This property must be in the range 1 - 12. The ValidateCard method compares this property against the system time to determine if the card is expired.

Data Type

Integer

CardExpYear Property (CardValidator Class)

Expiration year of the credit card specified in CardNumber .

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetCardExpYear();
int SetCardExpYear(int iCardExpYear);

Unicode (Windows)
INT GetCardExpYear();
INT SetCardExpYear(INT iCardExpYear);

int inpay_cardvalidator_getcardexpyear(void* lpObj);
int inpay_cardvalidator_setcardexpyear(void* lpObj, int iCardExpYear);

int GetCardExpYear();
int SetCardExpYear(int iCardExpYear);

Default Value

0

Remarks

This field contains the year portion of the expiration date of the customer's credit card. This property must be in the range 00-99, or 2000-2099. The ValidateCard method compares this property against the system time to determine if the card is expired.

Data Type

Integer

CardNumber Property (CardValidator Class)

Credit card number to be validated.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetCardNumber();
int SetCardNumber(const char* lpszCardNumber);

Unicode (Windows)
LPWSTR GetCardNumber();
INT SetCardNumber(LPCWSTR lpszCardNumber);

char* inpay_cardvalidator_getcardnumber(void* lpObj);
int inpay_cardvalidator_setcardnumber(void* lpObj, const char* lpszCardNumber);

QString GetCardNumber();
int SetCardNumber(QString qsCardNumber);

Default Value

""

Remarks

This property contains the customer's credit card number. A credit card number may be of any length, and may optionally include dashes or spaces. However, in practice the maximum length of the supported CardTypes is 19 characters (excluding whitespace), and the minimum length is 13 characters.

Data Type

String

CardType Property (CardValidator Class)

Indicates the results of the Luhn Digit Check algorithm.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetCardType();

Unicode (Windows)
INT GetCardType();

VCT_UNKNOWN(0), 
VCT_VISA(1), 
VCT_MASTER_CARD(2), 
VCT_AMEX(3), 
VCT_DISCOVER(4), 
VCT_DINERS(5), 
VCT_JCB(6), 
VCT_VISA_ELECTRON(7), 
VCT_MAESTRO(8), 
VCT_CUP(9), 
VCT_LASER(10)

int inpay_cardvalidator_getcardtype(void* lpObj);

int GetCardType();

Default Value

0

Remarks

This property is filled after a call to the ValidateCard method. Allowable values include:

This property is read-only and not available at design time.

Data Type

Integer

CardTypeDescription Property (CardValidator Class)

Human-readable description of the CardType .

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetCardTypeDescription();

Unicode (Windows)
LPWSTR GetCardTypeDescription();

char* inpay_cardvalidator_getcardtypedescription(void* lpObj);

QString GetCardTypeDescription();

Default Value

""

Remarks

This property is filled after calling the ValidateCard method, and will contain a text description of the CardType. This is useful to distinguish different program cards. For instance, a CardType of ccDiners might have a corresponding CardTypeDescription of "Diner's Club International", "Diner's Club Carte Blanche", or "Diner's Club enRoute".

This property is read-only.

Data Type

String

DateCheckPassed Property (CardValidator Class)

Indicates whether the card is expired or not.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetDateCheckPassed();

Unicode (Windows)
BOOL GetDateCheckPassed();

int inpay_cardvalidator_getdatecheckpassed(void* lpObj);

bool GetDateCheckPassed();

Default Value

FALSE

Remarks

The ValidateCard method checks whether the card's expiration date (CardExpMonth and CardExpYear) is a valid future date, and stores that result in the DateCheckPassed property.

This property is read-only.

Data Type

Boolean

DigitCheckPassed Property (CardValidator Class)

Indicates the results of the Luhn Digit Check algorithm.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetDigitCheckPassed();

Unicode (Windows)
BOOL GetDigitCheckPassed();

int inpay_cardvalidator_getdigitcheckpassed(void* lpObj);

bool GetDigitCheckPassed();

Default Value

FALSE

Remarks

The ValidateCard method checks whether or not the CardNumber conforms to the mod-10 digit check algorithm, and stores that result in the DigitCheckPassed property. Note that a card may pass this check and still be an invalid card. (Either a fake number that passes the digit check, or an unknown CardType).

This property is read-only.

Data Type

Boolean

TrackData Property (CardValidator Class)

Magnetic stripe data read off the credit card.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* GetTrackData();
int SetTrackData(const char* lpszTrackData);

Unicode (Windows)
LPWSTR GetTrackData();
INT SetTrackData(LPCWSTR lpszTrackData);

char* inpay_cardvalidator_gettrackdata(void* lpObj);
int inpay_cardvalidator_settrackdata(void* lpObj, const char* lpszTrackData);

QString GetTrackData();
int SetTrackData(QString qsTrackData);

Default Value

""

Remarks

This property may be set with the magnetic stripe read off the back of a credit card using any commercially available card reader. You may set this property with either Track1 or Track2 data. If TrackData is set, the values contained in CardNumber, CardExpMonth, and CardExpYear are ignored when calling ValidateCard. Instead, these properties are parsed out of the track data. This allows you to easily retrieve the expiration date and card number from either Track1 or Track2 data. For instance:

CardValidator1.TrackData = "4012000033330026=21121015432112345678" CardValidator1.ValidateCard()

The CardNumber, CardExpMonth, and CardExpYear will now contain the values parsed from the track data. TrackType will also indicate whether the TrackData is Track1 or Track2 (in this case, it's Track2 data).

Data Type

String

TrackType Property (CardValidator Class)

Indicates the type of the specified TrackData .

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int GetTrackType();

Unicode (Windows)
INT GetTrackType();

TT_UNKNOWN(0), 
TT_TRACK_1(1), 
TT_TRACK_2(2)

int inpay_cardvalidator_gettracktype(void* lpObj);

int GetTrackType();

Default Value

0

Remarks

This property will be filled after a call to ValidateCard. If magnetic stripe data was supplied in the TrackData field, this property will indicate which type of track was entered. If no track data was entered (ie, the CardNumber was specified instead) then the TrackType will be ttUnknown.

This property is read-only and not available at design time.

Data Type

Integer

Config Method (CardValidator Class)

Sets or retrieves a configuration setting.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);

char* inpay_cardvalidator_config(void* lpObj, const char* lpszConfigurationString);

QString Config(const QString& qsConfigurationString);

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

Reset Method (CardValidator Class)

Clears all properties to their default values.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int Reset();

Unicode (Windows)
INT Reset();

int inpay_cardvalidator_reset(void* lpObj);

int Reset();

Remarks

This method clears all properties to their default values.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

ValidateCard Method (CardValidator Class)

Checks the card number and expiration date for validity.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
int ValidateCard();

Unicode (Windows)
INT ValidateCard();

int inpay_cardvalidator_validatecard(void* lpObj);

int ValidateCard();

Remarks

This method performs several checks on customer information to determine if the card information submitted could be valid. This should be done before submitting an actual transaction for authorization. The tests performed are listed below:

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Error Event (CardValidator Class)

Information about errors during data delivery.

Syntax

• C++
• C
• Qt

ANSI (Cross Platform)
virtual int FireError(CardValidatorErrorEventParams *e);

typedef struct {
  int ErrorCode;
  const char *Description;
  int reserved;
} CardValidatorErrorEventParams;


Unicode (Windows)
virtual INT FireError(CardValidatorErrorEventParams *e);

typedef struct {
  INT ErrorCode;
  LPCWSTR Description;
  INT reserved;
} CardValidatorErrorEventParams;

#define EID_CARDVALIDATOR_ERROR 1

virtual INT INPAY_CALL FireError(INT &iErrorCode, LPSTR &lpszDescription);

class CardValidatorErrorEventParams {
public:
  int ErrorCode();

  const QString &Description();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};

// To handle, connect one or more slots to this signal.
void Error(CardValidatorErrorEventParams *e);

// Or, subclass CardValidator and override this emitter function.
virtual int FireError(CardValidatorErrorEventParams *e) {...}

Remarks

The Error event is fired in case of exceptional conditions during message processing.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Config Settings (CardValidator Class)

Trappable Errors (CardValidator Class)

Error Handling (C++)

Call the GetLastErrorCode() method to obtain the last called method's result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

CardValidator Errors

	504   Luhn digit check failed.
	505   Card date invalid.
	506   Card expired.
	703   Invalid CardNumber format (contains letters or unknown characters).
	704   Could not determine the Credit Card type.
	705   Error parsing TrackData. Format cannot be determined.