I use Woocommerce plugin. All works great, but I need add to PayPal IPN 'custom' field only 1 word instead "order_id" that writes at 'custom' field now.
I trying edit this file: ...woocommerce/classes/gateways/paypal/class-wc-gateway-paypal.php here you can see code
Need to change script that send "order_id" to PayPal on script that send my word to PayPal. That's all.
I believe it's easy to do. Please help. Appreciate any answers. Thanks.!