Card Networks

from iso8583sim.core.parser import ISO8583Parser

parser = ISO8583Parser()
message = parser.parse(raw_message)

print(message.network)  # CardNetwork.VISA

from iso8583sim.core.types import detect_network

detect_network("4111111111111111")    # CardNetwork.VISA
detect_network("5500000000000004")    # CardNetwork.MASTERCARD
detect_network("378282246310005")     # CardNetwork.AMEX
detect_network("6011111111111117")    # CardNetwork.DISCOVER
detect_network("3530111333300000")    # CardNetwork.JCB
detect_network("6200000000000005")    # CardNetwork.UNIONPAY

from iso8583sim.core.types import CardNetwork

# During parsing
message = parser.parse(raw_message, network=CardNetwork.MASTERCARD)

# In message object
message = ISO8583Message(
    mti="0100",
    network=CardNetwork.VISA,
    fields={...}
)

from iso8583sim.core.types import NETWORK_SPECIFIC_FIELDS

# Get VISA-specific field 62 definition
visa_field_62 = NETWORK_SPECIFIC_FIELDS[CardNetwork.VISA].get(62)

from iso8583sim.core.validator import ISO8583Validator
from iso8583sim.core.types import CardNetwork

validator = ISO8583Validator()

message.network = CardNetwork.VISA
errors = validator.validate_message(message)

# Checks:
# - Required fields are present
# - Network-specific field formats
# - Network-specific business rules