xavierT-14

Problem:
The client is experiencing a fatal error when downloading invoices from their account on a WooCommerce site. The error message indicates that an array is being passed instead of a string to the WP_Translation_Controller::translate() function.
Solution:
We have identified that the issue is related to the payment platforms like PayZen or SystemPay, which store their titles and descriptions in an array with the locale as the key. To resolve the conflict between WPML and SystemPay, we recommend the following steps:
1. Backup your files and site.
2. Access the functions.php file of your theme via FTP or Cpanel.
3. Add the following code:

add_filter( 'option_woocommerce_systempay_settings', function( $settings ) {
    $locale = get_locale();
    foreach ( [ 'redirect_success_message', 'redirect_error_message' ] as $key ) {
        if ( is_array( $settings[ $key ] ) ) {
            $settings[ $key ] = isset( $settings[ $key ][ $locale ] )
                ? $settings[ $key ][ $locale ]
               : $settings[ $key ]['en_US'];
        }
    }

    return $settings;
} );
add_filter( 'option_woocommerce_systempaystd_settings', function( $settings ) {
    $locale = get_locale();
    foreach ( [ 'title', 'description' ] as $key ) {
        if ( is_array( $settings[ $key ] ) ) {
            $settings[ $key ] = isset( $settings[ $key ][ $locale ] )
                ? $settings[ $key ][ $locale ]
                : $settings[ $key ]['en_US'];
        }
    }

    return $settings;
} );

This solution resolves the conflict with WPML. But it should also help the authors to resolve the conflict with PDF Invoices & Packing Slips for WooCommerce. If this solution does not apply to your case or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket.