MaskedCardNumber

What may be kept of a payment card once its number is gone (PCI DSS): its brand, where a listed scheme issued it, and its last four digits, shown as Visa •••• 4242. money.mask makes one from a PaymentCardNumber. Personal data.

Money and banking; not ordered; since Jadpo 0.1.0.

Make one

Build one from its fields, MaskedCardNumber { last_four: ... }.

This operation gives one: money.mask.

Fields

Text, JSON and storage

It has no single text form, so text.from and text.parse don't take it. JSON sends an object of its parts.

It is stored in 2 columns, each named for the field, _ and its suffix. This is {"brand":"american_express","last_four":"0005"}:

Shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Operations

• money.mask(card: PaymentCardNumber) -> MaskedCardNumber: What may be kept of card once its number is gone: its brand, told by its first digits from the ranges each scheme publishes (none for a range no listed scheme issues), and its last four digits.

Like every standard type, it also has the contract's own operations: text.format, json.read, json.write and ==. It isn't ordered, so < and sorting don't take it. Every standard type meets one contract says how they work.