How to pack Visa acquiring spec field 56 (TLV)

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Suman Deb Nath

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Sep 19, 2018, 6:37:47 PM9/19/18
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Hi,

Iam new in jpos library. And finding difficulty in packaging visa field 56. can someone suggest  me how do it correctly. 

chhil

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Sep 19, 2018, 10:26:35 PM9/19/18
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You need to write a custom class that take a string value and parses the multiple tag length values and save the tag value in a map and use it.

Here https://groups.google.com/d/msg/jpos-users/VjHm_YlclkE/KMn2rzVABgAJ is a sample of someones custom LTV. Note that its not TLV but conceptually equivalent.

If you are very adventurous you can define your packager xml to parse out the tlv for you 
https://github.com/jpos/jPOS/tree/master/jpos/src/main/java/org/jpos/tlv

Look at the test cases on how its used 
github.com/jpos/jPOS/blob/master/jpos/src/test/java/org/jpos/tlv/packager/ISOTaggedSequenceTest.java

Look at how the packager is defined for TLV fields used in test cases above 
https://github.com/jpos/jPOS/blob/master/jpos/src/test/resources/org/jpos/tlv/tagged-sequence-packager.xml

My preferred way is to write a small class that parses out the TLV values into a map during unpack time. To send updated values in a responses, you would create a map with tag values and then iterate through it creating TLV for each key value pair , concatenating it and setting it in the field.

-chhil

-chhil

On Thu, Sep 20, 2018 at 4:07 AM Suman Deb Nath <suman....@gmail.com> wrote:
Hi,

Iam new in jpos library. And finding difficulty in packaging visa field 56. can someone suggest  me how do it correctly. 

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Kogan Moonsamy

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Sep 20, 2018, 3:48:22 AM9/20/18
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Hi,

We are currently using the TLVList library and it works well.

Regards
Kogan

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Suman Deb Nath

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Sep 20, 2018, 3:50:49 AM9/20/18
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Hi Kogan,

Can you please share me any example or sample


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Kogan Moonsamy

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Sep 20, 2018, 3:54:25 AM9/20/18
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Hi Suman,

Before I do, are you developing a Visa SMS or DMS switch?

Regards
Kogan

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Suman Deb Nath

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Sep 20, 2018, 4:27:06 AM9/20/18
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DMS


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chhil

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Sep 20, 2018, 4:42:11 AM9/20/18
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If your field is BER (basic encoding rule) TLV then you can use TLVList else you need to write your own parser.

-chhil

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Kogan Moonsamy

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Sep 20, 2018, 4:42:49 AM9/20/18
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you will first need a list of the EMV tags valid for DE59 (You can find this on the Visa online portal). Most of them will adhere to the EMV spec, which most issuing organisations follow anyway.
Then its as easy as the following snippet:
TLVList tlvList = new TLVList();
tlvList.append(some_tag, some_value) /* To add a tag */
tlvList.deleteByTag(some_tag)

Have a look at the library for much much more...

DMS


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Kogan Moonsamy

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Sep 20, 2018, 4:44:01 AM9/20/18
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Agreed Chhil... 

I know the VISA VIP spec uses Ber, so he should be fine to use TLVList.

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chhil

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Sep 20, 2018, 4:48:01 AM9/20/18
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When in doubt on how to use it, look at the test cases

https://github.com/jpos/jPOS/blob/master/jpos/src/test/java/org/jpos/tlv/TLVListTest.java

-chhil

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Kogan Moonsamy

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Sep 20, 2018, 4:52:02 AM9/20/18
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When one is new to jpos and is pressed for time, its easy to get flustered and not look at the test cases. I know because I have been there.... Good advise thou Chhil :)

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Suman Deb Nath

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Sep 20, 2018, 4:58:56 AM9/20/18
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Thanks you very much Kogan and Chhil. Its getting clear now.
Correct me if I am wrong about BER TLV:

BER TLV:(Lets take tag is C0)

Tag-> The size is 1 byte(can be more than 1 byte).  HEX number will be encoded in bytes. So C0 will be of 1 byte in size (1 byte is equal to two HEX number).

Length-> 1 byte binary, so the length will encoded as binary. Length also can be more than 1 byte 

Value-> Will be encoded as EBCDIC/ASCII 


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Suman Deb Nath
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NIT Agartala

Kogan Moonsamy

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Sep 20, 2018, 5:05:25 AM9/20/18
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Hi Suman,

Judging by your question, I think that the best thing for you to do is to read up on BerTLV yourself and understand how it works before using it.

We dont want to re-invent the wheel by explaining something that has already been explained.

Glad I can help. Hope you come right.

Regards
Kogan

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Suman Deb Nath

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Sep 20, 2018, 5:20:33 AM9/20/18
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Thanks Kogan

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