Write a JS ISO8583 parser

[ashgansh]

A lot of the tooling for payments is written in golang.

To get this project started we'd actually need to start to parse iso8583 messages.

basically going from left to right:

---

Here's some inspiration of an existing project that does did.

https://github.com/moov-io/iso8583

There's also this resource: https://iso8583.info/

happy to pay for an account if it helps anyone move on this

[lrnt]

The most important fields should be:

• DE3 => processing code
  • char 1-2: transaction type (purchase, withdrawal, ...)
  • char 3-4: from account (would ignore this for now)
  • char 5-6: to account (would ignore this for now)
• DE4 => transaction amount (in lowest possible denomination, cents for example)
• DE6 => billing amount (in lowest possible denomination, cents for example)
• DE22 => POS entry mode (chip, contactless, ... + pin capability)
• DE25 => POS condition code (normal transaction, ecom payment, mail/telephone order, verification check, ...)
• DE43 => acquirer name and location
  • char 1-25: merchant name
  • char 26-28 city name
  • char 39-40 country code
• DE49 => transaction currency code (ISO4217)
• DE51 => billing currency code (ISO4217)

---

I would only focus on the 1987 version of the ISO8583 standard. The newer versions are not used by the biggest payment schemes.

The wikipedia article on the ISO8583 standard shouldn't be underestimated. It has a great summary of all the important data elements from the 1987 version.

[ashgansh]

@lrnt any sample we could put here?

[lrnt]

@lrnt any sample we could put here?

Created a PR to add some samples: #2

[ashgansh]

did a first iteration #3