From 0c34b6e4341bc880a2d1ca4b32810c5e766cd3eb Mon Sep 17 00:00:00 2001
From: Malith Senaweera <malith.senaweera@automattic.com>
Date: Mon, 15 May 2023 07:48:05 -0700
Subject: [PATCH 1/4] Bring back the rest-user-exists-controller

This fixes an error that happens during the plugin upgrade process.
We'll need to keep this file until a more robust solution is found.
---
 .../class-wc-rest-user-exists-controller.php  | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 includes/admin/class-wc-rest-user-exists-controller.php

diff --git a/includes/admin/class-wc-rest-user-exists-controller.php b/includes/admin/class-wc-rest-user-exists-controller.php
new file mode 100644
index 00000000000..920b1f09459
--- /dev/null
+++ b/includes/admin/class-wc-rest-user-exists-controller.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * Class WC_REST_User_Exists_Controller
+ *
+ * @package WooCommerce\Payments\Admin
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * REST controller to check if a user exists.
+ */
+class WC_REST_User_Exists_Controller extends WP_REST_Controller {
+
+	/**
+	 * Endpoint namespace.
+	 *
+	 * @var string
+	 */
+	protected $namespace = 'wc/v3';
+
+	/**
+	 * Endpoint path.
+	 *
+	 * @var string
+	 */
+	protected $rest_base = 'users/exists';
+
+	/**
+	 * Configure REST API routes.
+	 */
+	public function register_routes() {
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base,
+			[
+				'methods'             => WP_REST_Server::CREATABLE,
+				'callback'            => [ $this, 'user_exists' ],
+				'permission_callback' => '__return_true',
+				'args'                => [
+					'email' => [
+						'required'    => true,
+						'description' => __( 'Email address.', 'woocommerce-payments' ),
+						'type'        => 'string',
+						'format'      => 'email',
+					],
+				],
+			]
+		);
+	}
+
+	/**
+	 * Retrieve if a user exists by email address.
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 *
+	 * @return WP_REST_Response
+	 */
+	public function user_exists( WP_REST_Request $request ): WP_REST_Response {
+		$email        = $request->get_param( 'email' );
+		$email_exists = ! empty( email_exists( $email ) );
+		$message      = null;
+
+		if ( $email_exists ) {
+			// Use this function to show the core error message.
+			$error   = wc_create_new_customer( $email );
+			$message = $error->get_error_message();
+		}
+
+		return new WP_REST_Response(
+			[
+				'user-exists' => $email_exists,
+				'message'     => $message,
+			]
+		);
+	}
+}
+

From c0d5e695c3cf375958d9c921a44cd0e4b1565b50 Mon Sep 17 00:00:00 2001
From: Malith Senaweera <malith.senaweera@automattic.com>
Date: Mon, 15 May 2023 07:59:17 -0700
Subject: [PATCH 2/4] Add changelog entry

---
 changelog/fix-plugin-upgrade | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 changelog/fix-plugin-upgrade

diff --git a/changelog/fix-plugin-upgrade b/changelog/fix-plugin-upgrade
new file mode 100644
index 00000000000..ca961eca64b
--- /dev/null
+++ b/changelog/fix-plugin-upgrade
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Missing file during plugin upgrade

From 1dd9f4056873ebe1973542c8da093807686740da Mon Sep 17 00:00:00 2001
From: Malith Senaweera <malith.senaweera@automattic.com>
Date: Mon, 15 May 2023 08:17:29 -0700
Subject: [PATCH 3/4] Remove changelog

---
 changelog/fix-plugin-upgrade | 4 ----
 1 file changed, 4 deletions(-)
 delete mode 100644 changelog/fix-plugin-upgrade

diff --git a/changelog/fix-plugin-upgrade b/changelog/fix-plugin-upgrade
deleted file mode 100644
index ca961eca64b..00000000000
--- a/changelog/fix-plugin-upgrade
+++ /dev/null
@@ -1,4 +0,0 @@
-Significance: patch
-Type: fix
-
-Missing file during plugin upgrade

From e039b80f89f38c203947705521ed54f0af51f939 Mon Sep 17 00:00:00 2001
From: Malith Senaweera <malith.senaweera@automattic.com>
Date: Mon, 15 May 2023 09:01:39 -0700
Subject: [PATCH 4/4] Add back changelog

---
 changelog/fix-plugin-upgrade | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 changelog/fix-plugin-upgrade

diff --git a/changelog/fix-plugin-upgrade b/changelog/fix-plugin-upgrade
new file mode 100644
index 00000000000..4f4b515c90b
--- /dev/null
+++ b/changelog/fix-plugin-upgrade
@@ -0,0 +1,5 @@
+Significance: patch
+Type: fix
+Comment: Temporary fix to hide an error notice that's printed during the plugin upgrade
+
+