Add WooCommerce Payments Inbox note (https://github.com/woocommerce/woocommerce-admin/pull/4013)

* Add WC Pay to allowed plugins

* Add WC Pay Note to Inbox

* Don't update WC Pay note content

Actioned notes are hidden from the Inbox it turns out, so there's
no need to update the content to reflect that the WC Pay plugin
has been installed.

* Add WC pay note only after April 14

Instead of only adding the Install Now button in April. Only
add the note so that the Install now button is always available
and generally, the note is more useful and actionable because
the plugin is actually available.

* Fix WC Pay note install action

* Check if WC Pay is active or installed

Not just if the plugin files are available. This addresses both the
case where the plugin may be active an in a different folder name,
and where the plugin may have been installed but is not active,
likely because it's been deactivated.

plugins/woocommerce-admin/src/Events.php

@@ -17,6 +17,7 @@ use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_New_Sales_Record;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Tracking_Opt_In;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Onboarding_Email_Marketing;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Personalize_Store;
+use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_WooCommerce_Payments;
 
 /**
  * WC_Admin_Events Class.
@@ -68,5 +69,6 @@ class Events {
 		WC_Admin_Notes_Tracking_Opt_In::possibly_add_tracking_opt_in_note();
 		WC_Admin_Notes_Onboarding_Email_Marketing::possibly_add_onboarding_email_marketing_note();
 		WC_Admin_Notes_Personalize_Store::possibly_add_personalize_store_note();
+		WC_Admin_Notes_WooCommerce_Payments::possibly_add_note();
 	}
 }

plugins/woocommerce-admin/src/FeaturePlugin.php

@@ -16,6 +16,7 @@ use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Order_Milestones;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Welcome_Message;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Woo_Subscriptions_Notes;
 use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_Tracking_Opt_In;
+use \Automattic\WooCommerce\Admin\Notes\WC_Admin_Notes_WooCommerce_Payments;
 
 /**
  * Feature plugin main class.
@@ -186,6 +187,7 @@ class FeaturePlugin {
 		new WC_Admin_Notes_Welcome_Message();
 		new WC_Admin_Notes_Facebook_Extension();
 		new WC_Admin_Notes_Tracking_Opt_In();
+		new WC_Admin_Notes_WooCommerce_Payments();
 	}
 
 	/**

plugins/woocommerce-admin/src/Notes/WC_Admin_Notes_WooCommerce_Payments.php

@@ -0,0 +1,148 @@
+<?php
+/**
+ * WooCommerce Admin WooCommerce Payments Note Provider.
+ *
+ * Adds a note to the merchant's inbox showing the benefits of the WooCommerce Payments.
+ *
+ * @package WooCommerce Admin
+ */
+
+namespace Automattic\WooCommerce\Admin\Notes;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * WC_Admin_Notes_WooCommerce_Payments
+ */
+class WC_Admin_Notes_WooCommerce_Payments {
+	/**
+	 * Note traits.
+	 */
+	use NoteTraits;
+
+	/**
+	 * Name of the note for use in the database.
+	 */
+	const NOTE_NAME = 'wc-admin-woocommerce-payments';
+
+	/**
+	 * Name of the note for use in the database.
+	 */
+	const PLUGIN_SLUG = 'woocommerce-payments';
+
+	/**
+	 * Name of the note for use in the database.
+	 */
+	const PLUGIN_FILE = 'woocommerce-payments/woocommerce-payments.php';
+
+	/**
+	 * Attach hooks.
+	 */
+	public function __construct() {
+
+		add_action( 'woocommerce_note_action_install-now', array( $this, 'install' ) );
+
+		add_action( 'wc-admin-woocommerce-payments_add_note', array( $this, 'add_note' ) );
+	}
+
+	/**
+	 * Maybe add a note on WooCommerce Payments for US based sites older than a week without the plugin installed.
+	 */
+	public static function possibly_add_note() {
+
+		if ( ! self::wc_admin_active_for( WEEK_IN_SECONDS ) || 'US' !== WC()->countries->get_base_country() ) {
+			return;
+		}
+
+		$data_store = \WC_Data_Store::load( 'admin-note' );
+
+		// We already have this note? Then exit, we're done.
+		$note_ids = $data_store->get_notes_with_name( self::NOTE_NAME );
+		if ( ! empty( $note_ids ) ) {
+
+			$note_id = array_pop( $note_ids );
+			$note    = WC_Admin_Notes::get_note( $note_id );
+
+			// If the WooCommerce Payments plugin was installed after the note was created, make sure it's marked as actioned.
+			if ( self::is_installed() && WC_Admin_Note::E_WC_ADMIN_NOTE_ACTIONED !== $note->get_status() ) {
+				$note->set_status( WC_Admin_Note::E_WC_ADMIN_NOTE_ACTIONED );
+				$note->save();
+			}
+
+			return;
+		}
+
+		$current_date = new \DateTime();
+		$publish_date = new \DateTime( '2020-04-14' );
+
+		if ( $current_date >= $publish_date ) {
+
+			self::add_note();
+
+		} else {
+
+			$hook_name = sprintf( '%s_add_note', self::NOTE_NAME );
+
+			if ( ! WC()->queue()->get_next( $hook_name ) ) {
+				WC()->queue()->schedule_single( $publish_date->getTimestamp(), $hook_name );
+			}
+		}
+	}
+
+	/**
+	 * Add a note about WooCommerce Payments.
+	 */
+	public static function add_note() {
+
+		$note = new WC_Admin_Note();
+		$note->set_title( __( 'Try the new way to get paid', 'woocommerce-admin' ) );
+		$note->set_content( __( 'Securely accept credit and debit cards on your site. Manage transactions without leaving your WordPress dashboard. Only with WooCommerce Payments.', 'woocommerce-admin' ) );
+		$note->set_content_data( (object) array() );
+		$note->set_type( WC_Admin_Note::E_WC_ADMIN_NOTE_INFORMATIONAL );
+		$note->set_icon( 'credit-card' );
+		$note->set_name( self::NOTE_NAME );
+		$note->set_source( 'woocommerce-admin' );
+		$note->add_action( 'learn-more', __( 'Learn more', 'woocommerce-admin' ), 'https://woocommerce.com/payments/', WC_Admin_Note::E_WC_ADMIN_NOTE_UNACTIONED );
+		$note->add_action( 'install-now', __( 'Install now', 'woocommerce-admin' ), false, WC_Admin_Note::E_WC_ADMIN_NOTE_ACTIONED, true );
+
+		// Create the note as "actioned" if the plugin is already installed.
+		if ( self::is_installed() ) {
+			$note->set_status( WC_Admin_Note::E_WC_ADMIN_NOTE_ACTIONED );
+		}
+
+		$note->save();
+	}
+
+
+	/**
+	 * Check if the WooCommerce Payments plugin is active or installed.
+	 */
+	protected static function is_installed() {
+		if ( defined( 'WC_Payments' ) ) {
+			return true;
+		}
+		include_once ABSPATH . '/wp-admin/includes/plugin.php';
+		return 0 === validate_plugin( self::PLUGIN_FILE );
+	}
+
+	/**
+	 * Install WooCommerce Payments when note is actioned.
+	 *
+	 * @param WC_Admin_Note $note Note being acted upon.
+	 */
+	public function install( $note ) {
+
+		if ( self::NOTE_NAME === $note->get_name() ) {
+			$install_request = array( 'plugin' => self::PLUGIN_SLUG );
+			$installer       = new \Automattic\WooCommerce\Admin\API\OnboardingPlugins();
+			$result          = $installer->install_plugin( $install_request );
+
+			if ( is_wp_error( $result ) ) {
+				return;
+			}
+
+			$activate_request = array( 'plugins' => self::PLUGIN_SLUG );
+			$installer->activate_plugins( $activate_request );
+		}
+	}
+}