Honor WooCommerce currency decimals in conversion events.

[faisalahammad]

Summary

WooCommerce add_to_cart and purchase events sent to GA4 now reflect the store's configured currency precision. Previously the JS helper that converted the integer minor-unit price back into a decimal value was hard-coded to divide by 100, so any store that set WooCommerce → Settings → General → Currency options → Number of decimals to anything other than 2 (e.g. 4 for BHD, 0 for JPY, 3 for KWD/OMR/TND) saw the wrong value arrive in GA4.

Fixes #12986

Changes

includes/Core/Conversion_Tracking/Conversion_Event_Providers/WooCommerce.php

Before: the wp_footer and maybe_add_purchase_inline_script inline scripts emitted the wcdata global with currency, products, add_to_cart, purchase, and eventsToTrack fields only. The decimal conversion happened downstream in JS, which had no way to read the store's minor-unit count.

After: both inline scripts also emit window._googlesitekit.wcdata.currency_minor_unit = <absint wc_get_price_decimals()>; so JS can recover the correct decimal precision.

sprintf( 'window._googlesitekit.wcdata.currency_minor_unit = %d;', absint( wc_get_price_decimals() ) ),

assets/js/event-providers/woocommerce.js

Before: formatPrice defaulted to currencyMinorUnit = 2 and the value was hard-coded at every call site.

After: formatPrice keeps = 2 as a defensive fallback but is now always called with the value read from the wcdata global. The new globalCurrencyMinorUnit is destructured alongside globalCurrency and passed into formatEventData / formatProductData, which in turn pass it to formatPrice for both the top-level value and each items[].price.

const {
    currency: globalCurrency,
    currency_minor_unit: globalCurrencyMinorUnit = 2,
    ...
} = global._googlesitekit?.wcdata || {};

Testing

Test 1: PHP price formatter honors the decimals option

1. composer test -- --filter WooCommerceTest::test_get_formatted_price_returns_correct_minor_units
2. Test sets woocommerce_price_decimals to 0, 2, and 4 and verifies get_formatted_price() produces the expected integer minor-unit count (e.g. 1.2345 with decimals=4 yields 12345, 500 with decimals=0 yields 500).

Result: 6 dataset cases pass.

Test 2: inline script exposes the decimals value to JS

1. composer test -- --filter WooCommerceTest::test_inline_script_emits_currency_minor_unit
2. Test registers the provider script, fires wp_footer, and asserts the rendered output contains wcdata.currency_minor_unit = 4; after setting woocommerce_price_decimals = 4.

Result: passes.

Test 3: JS event provider formats values per currency decimals

1. BABEL_ENV=test NODE_ENV=test node_modules/.bin/jest --config tests/js/jest.config.js --rootDir . --passWithNoTests assets/js/event-providers/woocommerce.test.js
2. Covers 0/2/3/4 decimals on both add_to_cart and purchase events, plus the fallback when currency_minor_unit is missing from wcdata.

Result: 8 tests pass.

Test 4: lint clean

1. composer lint -- includes/Core/Conversion_Tracking/Conversion_Event_Providers/WooCommerce.php tests/phpunit/integration/Core/Conversion_Tracking/Conversion_Event_Providers/WooCommerceTest.php tests/phpunit/includes/wc-functions-stub.php
2. node_modules/.bin/eslint --no-eslintrc --config .eslintrc.json --ignore-path .eslintignore assets/js/event-providers/woocommerce.js assets/js/event-providers/woocommerce.test.js

Result: clean.

Manual reproduction (before this fix)

1. Set Number of decimals to 4 under WooCommerce → Settings → General → Currency options.
2. Add a product priced at 1.2345.
3. Open Google Tag Assistant; click Add to cart.
4. Before the fix: dataLayer shows value: 123.45 and items[0].price: 123.45. After the fix: both show 1.2345.

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