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

here screenshot of code that maybe needs to change

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.!


You almost gave the answer yourself :o)


'custom' => serialize( array( $order_id, $order->order_key ) ),


'custom' => 'yourword',

and you're done!

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  • Mr. Ewout, please help me again. I need to do the same thing - to add a "custom" parameter to all payments from my website. Only difference is now I use Wordpress 4.5.3 and I can't find even the word "custom" there. here the screenshot, where it probably should be: i.piccy.info/i9/759c50ab52808a6dc4d89684e40e8e30/1467032457/… Am I right? Help me please – Tuffguy Jun 27 '16 at 13:02

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