Facebook for WooCommerce: Hardcode the currency sent to Facebook for all products

sv_fb_for_woocommerce_hardcode_currency_for_all_products.php

<?php //only copy if required

/*
 * Set the currency of all products sent to Facebook as e.g. `ZAR`
 */
function sv_facebook_for_woocommerce_integration_prepare_product_set_currency( $product_data ) {

    // change the currency below to control all products sent to Facebook
    $product_data['currency'] = 'ZAR';

    return $product_data;
}

add_filter( 'facebook_for_woocommerce_integration_prepare_product', 'sv_facebook_for_woocommerce_integration_prepare_product_set_currency', 10, 1 );