A Java library for generating and parsing ISO-8583 financial messages. It uses the builder pattern and provides complete flexibility to provide custom decoders and encoders.

To use the library, simply create an ISO8583 object and define the fields you need. You can then set the values for each field and build the ISO-8583 message object.

Here's an example:

ISO8583 builder = ISO8583.create()
    .setCharset(StandardCharsets.ISO_8859_1)
    .setMessageLengthInterpreter(2, new HexMessageLengthInterpreter())
    .setHeader(TPDU.fromDecimal("60", "121", "121"), new TPDUHeaderInterpreter())
    .setMTI("0200", new BCDMTIInterpreter());

builder.defineField(2,
    BCD.create(LengthType.LL, 19, ContentPad.RIGHT_0)
        .setDescription("Primary Account Number")
        .setValueFormatter(new MaskCardNumber()));

// set values
builder.buildMessage().setValue(2, "6219861026599414");

// ...

To define a field, use the defineField() method on your ISO8583 object. You'll need to provide the field number, data type, length, and any other necessary parameters.

For example:

builder.defineField(2,
    BCD.create(LengthType.LL, 19, ContentPad.RIGHT_0)
        .setDescription("Primary Account Number")
        .setValueFormatter(new MaskCardNumber()));

Once you've defined your fields, you can set their values using the setValue() method on your ISO-8583 message object.

For example:

Message message = builder.buildMessage();
message.setValue(2, "6219861026599414");

byte[] pack = message.pack();

This project may have limitations and issues, as it has not been actively maintained and enhanced after being used as a basis for an enterprise project.

Nevertheless, Contributions are welcome! You can fork the repository and submit a pull request with your changes or open an issue to report errors.

This project is licensed under the MIT License.