Credit Card Numbers - Validation / Checksum
Mar 19, 2008
I have a userform capturing Credit Card Numbers for Visa, Master, Amex and Diners as part of a payment tracking system and would like to check that the entered Card Number is valid before processing the payment through a third-party website to minimize to number of error / invalid card messages.
I suspect there is some kind of checksum built into the cardnr. Any tips on how to check for the validity would be appreciated, including links to relevant sites.
this question is related to an earlier question of mine: [url]
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Jun 19, 2007
I have a database which holds a field for people's credit card numbers. When I try to import them into excel it removes the last number and replaces it with a 0. So if I have credit card number 123456789123456 it will show as 1.23456E+15. Then when i format it as a number is shows as 123456789123450.
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Nov 20, 2013
I need to extract the credit card expiration date from a cell. For example
1111 1111 1111 1111 1/17 code 1111
I was able to get the /17 using =MID(C77,FIND("/",C77),4)
However, I can't get the "1" before the /.
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Nov 8, 2008
I have around 300 7 digit numbers prefixed with a letter. Two examples X4032818 G8007700 The letter is a form of checksum to check if the numbers are correct. I have tried a number of Chksum algorithms but stuck on this one. The letters I and O are not used leaving 24 letters. I have used MOD with a divisor of 24 and compared it with a table, 0=A thru to 23=Z
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Oct 10, 2013
I want to create a VBA function that can calculate the CRC32 checksum for a file.
I found this webpage which looks promising: http:[url].....
The only catch is that the code provided is VB not VBA. How hard would it be to tweak this code to run in VBA?
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May 4, 2009
I have a sheet which details specific card numbers in Column A, and the date and place of transaction in the Column B. This very long list contains multiple entries for each card number. What I would like to do is use Sheet2 to list each card number and the number of times it appears in the list.
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Aug 15, 2014
I need a macro that searches through column F(amount). If it finds a negative amount(a credit note), it should search through column A(client ID), look for the same client and deduct the amount from the oldest invoice of this client. Then it should delete the whole line of the credit note.
If it doesn't find the same client, it should not adjust anything.
If the negative amount is a cancellation(all records with the invoice number 9999999), it should not adjust anything.
If the amount of the oldest invoice is smaller than the credit note, it should deduct down to 0 and deduct the rest of the credit note from the second oldest invoice.
I have attached a sample file : makro credit note.xlsx‎
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Dec 19, 2007
I have been trying to write a macro but its getting very complicated and im just getting confused. I need to look through a long list of data and see if there is a comparable figure. e.g if there is £350 at branch A for supplier X, i need to know if there is also a credit of £350 at branch A for the same supplier..
The problem is that the comparable figure could be above or below the original figure. Then i will delete both these lines from the list. I have tried to do this but have got cofused by so many if and else formulas.
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Apr 6, 2012
Why doesn't a three column formula work?
Column C is Credit, D is Debit, E is Balance
I put the following formula in the Balance column
=E21+C22-D22
where the first term refers to cell immediately above. In other words, this formula takes the prior balance, adds a credit if any, subtracts a debit, if any, and gives a new balance.
The formula worked on the cell I put it in. It will not work when I copy and pasted it into the cell below the first one. Error I get is circular reference.
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Oct 2, 2007
how can I set a cell so that you can only type in 1 , 2 , 3, 4, 5
I know I can use the validation but people can just copy a cell and paste it over.
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May 11, 2013
The numbers will be both negative and positive just need to catch characters.
So:
2500 is okay
-15 is okay
is not okay.
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Dec 17, 2007
I am trying to make validation so a textbox in a form can only accept only letters. At the moment however i can only seem to stop it entering numbers on its own, i cant stop it from accepting letters and numbers. here is the code so far. (please try keep the code simple as possible i have seen more diffuclt solutions but they are to difficult)
Private Sub LetterVal()
'Validation to ensure only Letters may be entered into the text box.
If IsNumeric(Textbox1) Then
Textbox1.BackColor = &HFF&
MsgBox ("Only letters aloud in field")
Else
Textbox1.BackColor = &H80000005
End If
End Sub
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Sep 4, 2009
I currently have cell B3 in a worksheet - able to except 2 data entries.
The user should enter either OPQ or BOT followed by numbers. How do i ensure that they only enter OPQ (O - Letter Not Number) followed by numbers, or BOT (O - Letter Not Number) followed by numbers.
i.e. OPQ87654321 NOT 0PQ87654321 or BOT12345678 NOT B0T12345678. The information has to be entered manually and not via drop down list as each number is unique to the OPQ or BOT.
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Oct 29, 2013
I have a file which contain lots of TAX Details of different country which we need to validate manually do we have any macro to validate them according to there countries
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Apr 4, 2013
I want to create data validation so that the first 2 digits=PS and the next 4 digits will be numbers. I have tried a few things but I cant get anything to work?
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Nov 22, 2006
Is it possible to force a cell entry (using Data Validation) to either a whole number or a value? In other words, I would like the data in a cell to be either a whole number between 10,000 and 20,000 or "N/A". I can do it with VBA, but Data Validation (if it's possible) would be better.
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Dec 2, 2006
I am looking for a solution for my problem: I work for a bus company, I need a spreadsheet where I will record the bus numbers into a sheet but I only want to be able to add the number once ie. error if duplicate bus entered. Also the numbers will change from time to time, old buses sold when new ones arrive. I have the following code that someone helped me with wich works fine provided you don't have to change the numbers.
=And(Or(And(E42>=121,E42<=125),And(E42>=149,E42<=156),And(E42>=320,E42<=363),And(E42>=700,E42<=799),And(E42>=800,E42<=991)), COUNTIF($B$3:$E$46,E42)<2)
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Jun 29, 2007
I want to use Data Validation on a cell (H1) to only allow the value entered to be values between values in E1 and D1. E1 is a negative number.I tried naming E1 & D1 as a range (valid) and then did custom validation formula is =valid, but that allows me to put in anything.
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Feb 16, 2012
How can I require 2 numbers before a decimal in data validation? I have a formula to require at least to characters after.
I'd like to require the user to enter at least ##.##
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Aug 28, 2007
to validate a cell for the following customer format, but cant get it to work:
XX00000
Where XX is any combination of letters (upper or lowercase) and
00000 is a combination of any 5 numbers.
It must always be in this format, with this number of digits in total (2 letters followed by 5 numbers)
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Aug 15, 2007
I have a user form to get some input from the user and want to make sure that in some textboxes user should be able enter only text i.e A to Z or a-z no numbers or special charecters.
Private Sub CommandButton1_Click()
Dim RegEx As Object
Dim Strng As String
Strng = CStr(Me.TextBox1.Value)
Set RegEx = CreateObject("vbscript.regexp")
With RegEx
.Pattern = "^[A-Z]{2}/d+/d{2}$"
If Not .test(Strng) Then MsgBox "Invalid Format: TextBox1"
End With
Set RegEx = Nothing
End Sub ..............................
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Jul 21, 2007
I am looking for a way to define a 'Data Validated' Cell to hold a List of Dynamic Sequential Numbers - from 1 to the Value of cell A4. For example:
If cell A4 has a value of 5 the 'Data Validated' List will be 1,2,3,4,5
I have tried to 'name' the Array-Formula {=ROW(INDIRECT("1:"&A4))} and put the 'name' as the List source but without success.
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Mar 15, 2012
I have created a template using data validations. I have a drop down in column O, which you can choose from Credit or Charge. In column V, I want:
- If selected Credit in column O, only negative numbers allowed in column V
- If selected Charge in column O, only positive numbers allowed in column V
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Nov 8, 2008
I am using Excel 07 with Vista, and creating a spreadsheet in which users will be inputting a record into every row.
There is a row that requires a number to be entered, where some of the numbers will begin with 0 or 00 or even 0000. I want to make sure no-one incorrectly enters a letter, however with data validation set to whole numbers, it formats the cell to change an entry of "005667" into just "5667". There is no set length for the field.
The only way to have "005667" is the change the column to text, but then obviously that defeats the whole purpose!
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Mar 5, 2010
I have 2 reports starting col A to W. I want a macro code for the below.
1st Report
1. 1st sort the entire report with col O leaving the headings.
2. 2nd delete the rows if where value of O is "Credit"
3. After the above step sort the entire report again with col H
2nd Report i hvae is also from Col A to AB. I want a macro code for below.
1. 1st sort the entire report with col O leaving the headings.
2. 2nd delete the rows if where value of O is "Credit"
3. 3rd delete the rows if where value of AB os "DEL"
4. After the above step sort the entire report again with col H
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May 7, 2009
btw i saw following soloved post but i didnt get the question and answer.
can u provide examples?
http://www.excelforum.com/excel-misc...ard-count.html
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Aug 9, 2009
I want to take random card dealings like in example:
So, 52 cards for 4 players. It doesn't matter where from formula takes values. Here is (yellow) just example in one column...
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Dec 31, 2008
I am trying to put together a userform based time card calculator. User inputs the time in the time out and how long of a lunch. Then the program will display total hours worked for the day. Ive attached what I have so far. The only thing that is not very clear is that I have one hidden textbox for the lunch. It is there only for calculating and the visible one is going to inc by :15 min.
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Nov 30, 2007
If any excel expert who know how to compare names that are similar to one other with a wild card,
for example
A
COLUMBUS STEEL CASTINGS CO. 2ND LIEN (AKA BP METALS)
B
BP METALS AKA COLUMBUS STEEL Total
A
LS POWER - BROADWAY GEN FUNDING LLC
B
BROADWAY GEN FUNDING, LLC Total
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Nov 10, 2009
My live sheet is a lot more complex but this will help me well on my way.
Ill let the example say everything:
Sheet3
ABC1Condition 1Condition 2Condition 32red lorrybig £ 92,621.98 3yellow carbig£ 145,498.33 4yellow vanbig£ - 5pink carsmall£ - 6red carsmall£2,552,404.50 7pink lorrybig£ 862.37 8green carbig£ - 9green lorrybig£ 707,083.31 10red vansmall£ 30,010.73 11green carbig£ 2,276.13 12 13 14Total of all cars that are big: 15expected answer £ 147,774.46
Excel tables to the web >> Excel Jeanie HTML 4
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