Paypal standard “SyntaxError: Unexpected token A in JSON at position 0”

@yanping

Could you please share a copy of your site’s System Status? You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”.? Once you’ve done that, paste it here in your response.

This is my local test server:

### WordPress Environment ###

WordPress address (URL): https://192.168.5.121/WP-Store
Site address (URL): https://192.168.5.121/WP-Store
WC Version: 5.9.0
REST API Version: ? 5.9.0
WC Blocks Version: ? 6.1.0
Action Scheduler Version: ? 3.3.0
WC Admin Version: ? 2.8.0
Log Directory Writable: ?
WP Version: 5.8.1
WP Multisite: –
WP Memory Limit: 512 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US
External object cache: –

————————–
//I think the problem is at function process_order_payment in class-wc-checkout.php

$result = apply_filters( ‘woocommerce_payment_successful_result’, $result, $order_id );

//as function wp_doing_ajax exists, is_ajax() below returns true
if ( ! is_ajax() ) {
// phpcs:ignore WordPress.Security.SafeRedirect.wp_redirect_wp_redirect
wp_redirect( $result[‘redirect’] );
exit;
}

//Causing SyntaxError: Unexpected token A in JSON at position 0 as $result is an array not a valid json string.
wp_send_json( $result );

I hard-coded
header( “Location: https://www.google.com”);
for testing paypal-standard redirect
in function process_order_payment in file class-wc-checkout.php

and it did not work. A blank error message showed up in check-out page.

Thanks for the update.

The System Status report above is truncated. In order to check your configuration and assist you further, could you please share a copy of your site’s System Status in full?

You can find it via WooCommerce > Status. Select Get system report and then Copy for support. Once you’ve done that, paste it here in your response.

I figured it out, the error was caused by a filter function I implemented that only worked for paypal express gateway that paypal made up to switch to last year.

Thanks for letting us know!

I’m marking this thread as resolved. If you have further questions, feel free to create a new thread.