Wholesale Price Field per Product

$wpide_wholesale_role = 'wholesale_customer'; // Role that pays wholesale prices.

$wpide_is_wholesale = function () use ( $wpide_wholesale_role ) {
    return is_user_logged_in() && in_array( $wpide_wholesale_role, (array) wp_get_current_user()->roles, true );
};

add_action( 'woocommerce_product_options_pricing', function () {
    global $product_object;

    woocommerce_wp_text_input( array(
        'id'        => '_wpide_wholesale_price',
        'label'     => 'Wholesale price (' . get_woocommerce_currency_symbol() . ')',
        'data_type' => 'price',
        'value'     => $product_object instanceof WC_Product ? $product_object->get_meta( '_wpide_wholesale_price' ) : '',
    ) );
} );

add_action( 'woocommerce_admin_process_product_object', function ( $product ) {
    // phpcs:ignore WordPress.Security.NonceVerification -- WooCommerce verifies the product save nonce.
    if ( isset( $_POST['_wpide_wholesale_price'] ) ) {
        $product->update_meta_data( '_wpide_wholesale_price', wc_format_decimal( wp_unslash( $_POST['_wpide_wholesale_price'] ) ) );
    }
} );

add_action( 'woocommerce_variation_options_pricing', function ( $loop, $data, $variation ) {
    woocommerce_wp_text_input( array(
        'id'            => '_wpide_wholesale_price[' . $loop . ']',
        'label'         => 'Wholesale price (' . get_woocommerce_currency_symbol() . ')',
        'data_type'     => 'price',
        'wrapper_class' => 'form-row form-row-full',
        'value'         => get_post_meta( $variation->ID, '_wpide_wholesale_price', true ),
    ) );
}, 10, 3 );

add_action( 'woocommerce_save_product_variation', function ( $variation_id, $i ) {
    // phpcs:ignore WordPress.Security.NonceVerification -- WooCommerce verifies the variations save nonce.
    if ( isset( $_POST['_wpide_wholesale_price'][ $i ] ) && current_user_can( 'edit_product', $variation_id ) ) {
        update_post_meta( $variation_id, '_wpide_wholesale_price', wc_format_decimal( wp_unslash( $_POST['_wpide_wholesale_price'][ $i ] ) ) );
    }
}, 10, 2 );

$wpide_wholesale_filter = function ( $price, $product ) use ( $wpide_is_wholesale ) {
    if ( ! $wpide_is_wholesale() ) {
        return $price;
    }

    $wholesale = $product->get_meta( '_wpide_wholesale_price', true, 'edit' );

    return '' !== $wholesale ? $wholesale : $price;
};

foreach ( array( 'woocommerce_product_get_price', 'woocommerce_product_variation_get_price', 'woocommerce_variation_prices_price' ) as $wpide_hook ) {
    add_filter( $wpide_hook, $wpide_wholesale_filter, 99, 2 );
}

add_filter( 'woocommerce_product_is_on_sale', function ( $on_sale, $product ) use ( $wpide_is_wholesale ) {
    return $wpide_is_wholesale() && '' !== $product->get_meta( '_wpide_wholesale_price', true, 'edit' ) ? false : $on_sale;
}, 10, 2 );

add_filter( 'woocommerce_get_variation_prices_hash', function ( $hash ) use ( $wpide_is_wholesale ) {
    $hash['wpide_wholesale'] = $wpide_is_wholesale() ? 'yes' : 'no';

    return $hash;
} );