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Adding a currency

Adding a currency is a config change, not a feature. In the common case it is a single entry in config/currencies.php plus one translation string. Everything else — validation, the Inertia props that feed the dropdowns, and conversion — derives from that entry automatically.

Reference PRs: #642 (NGN), #644 (GHS).

The one required change

Add an entry to the options array in config/currencies.php:

[
    'code' => 'NGN',            // ISO 4217 code, stored on users/accounts
    'name' => 'Nigerian Naira', // English name; the __() key for translations
    'allows_primary' => true,   // can be a user's primary/display currency
    'allows_account' => true,   // can be an individual account's currency
],

allows_primary / allows_account are independent. Assets you can hold but not display everything in (e.g. BTC) are allows_account => true, allows_primary => false.

That's the whole wiring. App\Services\CurrencyOptions reads this config and feeds:

Validation — in: rules in ProfileUpdateRequest, StoreAccountRequest, UpdateAccountRequest all pull from CurrencyOptions, so the new code is accepted the moment it's in config.
The UI dropdowns — HandleInertiaRequests shares primaryOptions() / accountOptions() as Inertia props; the React selects render whatever is there.
Conversion — CurrencyConversionService fetches {date}/v1/currencies/{code}.min.json from the @fawazahmed0/currency-api CDN and ExchangeRateService stores rates as JSON. Both lowercase the code and are currency-agnostic, so any code the provider covers just works. No code change.

The translation (do this too)

CurrencyOptions runs the name through __() in PHP before handing it to the frontend, so add the Spanish name to lang/es.json:

"Nigerian Naira": "Naira Nigeriano",

Spanish (es) is the enforced locale. French (lang/fr.json) is optional and warning-only — add it if you can (#644 did), skip it otherwise.

⚠️ LocalizationTest scans TS/TSX source for __() keys. Currency names are translated in PHP and never appear literally in the frontend, so a missing Spanish name is not auto-caught by CI. Add it by hand or the UI shows the English name.

Optional: a custom symbol

resources/js/utils/currency.ts has a small getCurrencySymbol map for short symbols ($, €, ₦). It falls back to the currency code, and formatCurrency uses Intl.NumberFormat which renders its own symbol regardless — so only add an entry if you want a specific short glyph:

NGN: '₦',

#644 (GHS) skipped this; #642 (NGN) added it. Both are fine.

Two things to verify before you add a code

Use the current ISO 4217 code. #644 was requested as GHC — the deprecated pre-2007 Ghanaian code. The provider still serves ghc, but at a rate scaled ×10 000 (Ghana redenominated: 1 GHS = 10 000 GHC), which would inflate every balance 10 000×. The correct modern code is GHS. Deprecated codes existing in the provider does not mean they're correct.
Confirm the provider actually covers it, at the right rate. Open https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies/{code}.min.json (lowercase) and check the code is present and the rate is sane (e.g. EUR→NGN ≈ 1567). If it's missing, conversion silently returns the unconverted amount (logged as a warning) — the currency is still selectable, it just won't convert.

Test & checklist

entry in config/currencies.php (code, name, allows_primary, allows_account)
Spanish name in lang/es.json (French in lang/fr.json if you can)
symbol in resources/js/utils/currency.ts (only if you want a custom glyph)
provider covers the code at the correct rate (verified via the CDN URL)

php artisan test --compact tests/Feature/CurrencyConversionServiceTest.php \
                           tests/Feature/LocalizationTest.php
vendor/bin/pint --dirty

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