Conflict with EDD software licensing add on

Hi,

First off- awesome plugin, thank you!

I found an issue with Easy Digital Downloads (EDD) software licensing (premium) add on:
https://easydigitaldownloads.com/downloads/software-licensing/

I hope this explanation makes sense…

Scenario:
WP install 1 is my EDD store, running: EDD, EDD software licenses, WP SpamShield
My test downloadable product allows buyers of this plugin to get automatic updates from the WP dashboard

WP install 2- on this site I have bought and installed the test downloadable product from WP install 1. I am NOT running WP-SpamShield on this site. When I go to activate the license key on the test downloadable product’s settings page an API request is sent to WP install 1 but something goes wrong in that process.

The issue is that the license keys are not activating or deactivating correctly. I believe this to be a plugin conflict because of this article, and disabling WP Spam Shield gets it working straight away.

Code:

// data to send in our API request
		$api_params = array(
			'edd_action'=> 'deactivate_license',
			'license' 	=> $license,
			'item_name' => urlencode( CLIPRO_DEMO_PRODUCT ), // the name of our product in EDD
			'url'       => home_url()
		);

		// Call the custom API.
		$response = wp_remote_post( CLIPRO_LOCALHOST, array( 'timeout' => 15, 'sslverify' => false, 'body' => $api_params ) );

		// make sure the response came back okay
		if ( is_wp_error( $response ) )
			return false;

		// decode the license data
		$license_data = json_decode( wp_remote_retrieve_body( $response ) );

		// @todo Sanitise $license_data response data and warn if error

		// $license_data->license will be either "deactivated" or "failed"
		if( $license_data->license == 'deactivated' )
			delete_option( 'edd_sample_license_status' );

(I’ve marked where additional sanitisation will at least stop the error bubbling to the user)

Error message:

Notice: Trying to get property of non-object in /mysite/wp-content/plugins/test-product-dummy-plugin-1.0.0/updater.php on line 187

Warning: Cannot modify header information - headers already sent by (output started at /mysite/wp-content/plugins/test-product-dummy-plugin-1.0.0/updater.php:187) in /mysite/wp-includes/pluggable.php on line 1196

I am assuming that the $license_data is coming back with a warning / not getting through at all.

Happy to provide any additional info you need to help you resolve this one. I appreciate this is a premium plugin and you’re obviously not expected to buy it just to support it. Perhaps you have an inkling as to the source of the issue and I can test stuff out on my side. Presumably wp_remote_retrieve_body()? I’m a plugin developer so can work my way round the codebase if you point me in the right direction.

Thanks!
Richard

https://wordpress.org/plugins/wp-spamshield/