I'm getting an error trying to configure paypal gateway.
Not sure if this is a bug or not. It's the only issue at all I've run into
Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /home/XXXX/XXXX.XXXX.com/modules/Invoice/ServicePayGateway.php on line 131
Anyone can help me with this, please?