Adjust journal type when syncing invoice

functions.php

<?php

add_action( 'storeabill_woo_order_synced_invoice', function( $invoice, $sab_order ) {
    $woo_order = $sab_order->get_order();
    // Check products and determine whether to use a custom journal type
    $condition = false;
    
    if ( $condition ) {
        $custom_journal_type = 'custom_invoice';
        
        if ( ! $journal = sab_get_journal( $custom_journal_type ) ) {
            sab_create_journal( $custom_journal_type );
        }
        
        $invoice->set_journal_type( $custom_journal_type );   
    }
}, 10, 2 );