Blog Home

Add extra custom fields to the ISO8583 simulator

Posted on 10th Feb 2021 1239 views

Because Every ISO8583 implementation has its own particularities, variations and custom behaviour, the ISO8583 simualtor from neaPay is designed from the begining for super fast configuration and customization.

Adding or removing extra fields or changing their behaviour is designed from the begining to be ultra easy.

 

Adding extra, custom fiedls to the ISO8583 simualtor is very easy.

Edit the spreadsheet and save, and you are done with test data configuration.

Edit the message that reads the test data and you can use the data in the simualtor

Edit the ISO8583 message fields building behaviour, and you have loaded the data into the transaction.

 

 

Edit Test Data Structure

In order to edit ISO8583 test data structure for the neaPay simulator, locate folder named test_data and open the spreadsheet inside.

The spreasheet will be called something like 

ISO8583_TestCases_v3.5.xlsm

Inside the spreadsheet file you will find several sheets, and for this example we will add a field on the Acquirer Sheet, which holds Acquirer specific data.

Edit ISO8583_Acquirer sheet to add a new field, a new column

For examplea add after column DE126, columns DE126.1, DE126.2, DE126.3 and so on, to be used as subfields. DE126 = data Element 126

Add values on the columns.

Press "Save Test Data CSV" button within the sheet.  IMPORTANT! 

That button exports csv. Check that on disk, file "ISO8583_Acquirer.csv" has been updated. 

Now the test data is updated.

 

Edit Acquirer sheet reading message

The Acquirer sheet is being read in the simulator like a normal connection.

The communication of the simulator with via the connection is done via a message.

All messages are configured in script_variables.js.

 

If you want to learn how to find out where a connection is used, read section below . Otherwise skip to section below. 

All connections are defined in script_connections.js

To find out how the "connection" to this test data is read, open script_connections.js and locate the name ISO8583_Acquirer.csv

The name of the connection is "AcquirerDataFile"

Search for "AcquirerDataFile" in script_acquirer.js

 

The line that uses this connection is 

receivedAcquirerDatamessage = receive(AcquirerData, AcquirerDataFile, true);

Which can be read as:

"receivedAcquirerDatamessage" takes values from receiving "AcquirerData" messages from "AcquirerDataFile" connection.

 

Update the test data reading message

If we want to read the updated data structure, then we need to update the structure of the message that reads it.

We go to script_variables.js and locate AcquirerData message

This message has all the columns of ISO8583_Acquirer sheet mapped to fields.

There is no naming correspondence, the fields are read from the csv file "ISO8583_Acquirer.csv" in order, meaning the 20th column goes to 20th field, no matter the name.

We will need to add our fields after field F126.

Copy this row to the next (duplicate), for as many rows as you have added columns to the sheet. 

Use suggestive names for the fields, because these names will be used in the scripts, later.

For example F126_1, F126_2, F126_3.

Now, if you start the simulator, these fields will be automatically read and available. But not used, Yet.

 

Use the values of the new fields.

The best approach is to look at existing scripting.

Simples way is to look up where field 126 is used, so search F126 in script_acquirer.js but we notice we do not use it.

So search for other fields for reference, like F125 or F127. 

 

We find function

function build_F125_Reserved{...}

and we can duplicate it into 

function build_F126_Custom{...}

and add a call to this funtion to 

function buildMessage(acquirerDataFromCsv);

This is where we call only the functions that we need to populate the fields.

 

Script building the field

In this function you can script the functionality you need, to populate this field.

Look at other functions and use various methods to populate the data. You can populate it automatically with date and time, or you can copy the values from the test data sheet.

For example, if you want to  set the value of F126 as a concatenation of its sub-fields, you can script it like below.

 

function build_F126_Custom(acquirerDataFromCsv) {
setVal(isoMessageAcqRq.F126,
acquirerDataFromCsv.F126_1.value+
   acquirerDataFromCsv.F126_2.value+
   acquirerDataFromCsv.F126_3.value
   );
setBitON(isoMessageAcqRq.F126.bitmap_position)
}

 

Some scripting skills are required for this section.

Contact us if you need help.

 

Keep in mind that the ISO8583 format is automatically protected by the core, all you need to supply is the value. The core will automatically set the lenght, trim or pad, convert , as needed.

 

 

 


LinkedIn

Top Read Articles


Read smart card chip data with APDU commands ISO 7816 22985 views

BIN List & Range for MasterCard, Visa, Amex, Diners, Discover, JCB, CUP 13840 views

Deploy, run and generate with neaPay Card Data Generator 10252 views

Run the neaPay ISO8583 simulator 9543 views

ISO8583 payments message format, programmers guide 9019 views

ISO8583 Message Converter JSON and XML interface specification mapping 6572 views

ISO8583 message: The list of ISO 4217 currency codes for data elements 49 and 52 6467 views

MCC Codes - Merchant Category Codes to use in ISO8583 Field 18 6191 views

ISO8583 Response Codes for Transaction processing 5768 views

Deploy the neaPay ISO8583 simulator - video guide 4974 views

Create a new test case in the neaPay ISO8583 simulator Video guide 4317 views

ISO8583 Message Types for Transaction Processing 4244 views

ISO8583 Processing Codes for Transaction Processing 3953 views

Log Files in BASE24 classic 3831 views

Performance testing at 500, 1000 and 1500 TPS 3421 views

BASE24 classic interview questions 3409 views

BASE24 documentation to read 3373 views

BASE24 classic vs BASE24-eps 3334 views

Asking for defects support for the neaPay products: converter, switch, issuer, simulator 3161 views

Connect the neaPay ISO8583 Acquirer simulator to your own host or Issuer 3143 views

Regression Testing in 1 click with instant Analytics and CSV report 2841 views

ISO8583 converter to JSON XML SQL to HTTP host - message flow - video guide - Part.2 2833 views

Load Test enabling and performance testing at 1TPS and 100TPS 2763 views

Sample Recommended design for an Acquirer test cases suite, Scenarios and Regression 2691 views

Card readers supported by neaPay payments simulator, CHIP and NFC 2627 views

BASE24 classic screens examples explained 2605 views

Run the neaPay ISO8583 converter to JSON, XML, SQL, in a test environment 2603 views

Adding your own card to the Payments simulator to test your system 2393 views

Changing fields definitions in the ISO8583 simulator and message converter 2382 views

How the fingerprint reader works in the ISO8583 payments simulator 2378 views

ISO8583 converter to JSON XML SQL to HTTP Host - host unavailable - video guide- Part.3 2335 views

Deploy the neaPay ISO8583 Payments converter in a test environment 2308 views

Altering test cases in Excel for the ISO8583 simulator 2305 views

Enabling traces in the payments simulator 2305 views

EMV explained for programmers 2305 views

ISO8583 converter to JSON XML SQL to HTTP host - start& run - video guide - Part.1 2305 views

Run One, Run Scenario, Run All, Run Load in the neaPay ISO8583 Simulator - Use guide 2304 views

BASE24 classic ATM configuration Tutorial in ATD and XPNET with examples 2275 views

BASE24-eps interview questions 2255 views

Deploy the neaPay HSM simulator in a test environment 2179 views

Cards and Banks Training 2084 views

BASE24 classic cards configuration tutorial with Examples 1994 views

Deploy the Payments Switch Router in a test environment 1845 views

BASE24-EPS ACI DESKTOP tutorial - Getting started 1727 views

Getting started with BASE24. Compiling your first TAL program 1721 views

BASE24 classic prefix configuration tutorial CPF with examples 1673 views

BASE24 classic tracing of transactions. Audits, configuration, enabling and opening 1574 views

BASE24 classic Institution configuration Tutorial with example 1461 views

BASE24 classic interchange configuration with examples 1429 views

BASE24 classic balance file configuration PBF with example 1413 views

ACI BASE24 classic automatic extract configuration 1387 views

Working with Base24-eps vs BASE24 Classic 1298 views

Add extra custom fields to the ISO8583 simulator 1240 views

Base24-eps how to create journals with esbldjnl 1213 views

BASE24 classic routing in IDF 1139 views

Getting started with Base24 development. TAL tutorial 1132 views

BASE24 classic External Message File configuration EMF with examples 1067 views

Getting started with using Prognosis for BASE24 and BASE24-eps 994 views

First steps with BASE24 Classic 965 views

ISO8583 ATM POS Crypto API integration with exchanges like Coinbase or Binance 953 views

What to expect when installing Base24-eps 935 views

BASE24 classic host configuration tutorial HCF with examples 919 views

Managing BASE24-eps implementation projects 866 views

Ask a question, get advice and help

   

Read related articles - Iso8583


Are you ready to start or need help?


Ready to start your next project with us? Give us a call or send us an email and we will get back to you as soon as possible!

Get a free quote, Ask for details, Get guidance


Contact us

Download and Use the software yourself


Download software

Follow a getting started guide to deploy and use the software


Get started