How to Send additional data from plugin

Hi there,

To send data, please see https://documentation.onesignal.com/docs/wordpress#section-customizing-wordpress-plugin-behavior, https://documentation.onesignal.com/docs/wordpress#section-onesignal_send_notification-filter, and the data parameter of https://documentation.onesignal.com/reference (data is a Hash).

To receive the sent data, please see https://documentation.onesignal.com/docs/web-push-sdk#section-notification-display (not supported in all environments).